Следниве 576 резултати се најдени од пребарувањето interactive simulation

Симулации

• Движење во 2-D
• Електричен хокеј
• Звучни бранови
• Молекули и светлост (HTML5)
• Нуклеарна фисија
• Повратни (реверзибилни) процеси
• Шетач (променливо праволиниско движење)
• Fractions: Intro (HTML5)
• Plinko Probability (HTML5)
• Fractions: Mixed Numbers (HTML5)
• Models of the Hydrogen Atom (HTML5)
• Projectile Data Lab (HTML5)

Активности

• Prediction Sheet for Linear Motion
• Concentration - Interactive Lecture Demonstration
• Reflection and Transmission Interactive Lecture
• Intro to Photoelectric Effect Interactive Lecture
• Intermolecular Forces and Molecules - Interactive Lecture Demonstration
• Probability and Randomness Interactive Lecture
• Electrolyte and Non-electrolyte Solutions - Interactive Lecture Demonstration
• Entropy, Microstates, and Probability - Interactive Lecture Demonstration Guide
• Intermolecular Forces and States of Matter - Interactive Lecture Demonstration
• Saturated Solutions - Interactive Lecture Demonstration
• Vector Addition Worksheet
• Investigation of a Solution’s Color (Qualitative and Quantitative) - Guided Inquiry Activity
• Kinetics Guided Inquiry
• Student Guide for PhET - States of Matter in html5
• Forces and Motion Basics Interactive Activity
• Visualization and Visual Illusions SIM Homework
• Costruisci un atomo (ITA)
• Density Simulation
• Color Vision Simulation Homework
• Sound Simulation Homework II
• Sugar and Salt Solutions: Exploring Common Substances Using a PhET Simulation
• Membrane Channels: inquiry into cellular diffusion
• Gene Machine: Lac Operon -an inquiry lesson
• Conductivity: an inquiry activity (also uses other sims)
• Circuit Construction Kit Simulation Homework
• Electric Field Hockey Simulation Homework
• Introduction to the Photoelectric Effect Simulation
• Natural Selection Simulation
• Battery-Resistor Circuit Simulation Homework III
• Traffic Control: How Cells Manage Molecular Movement
• Balanced and Unbalanced Forces - What Causes Acceleration
• Energy Forms and Changes Simulation
• Rutherford Scattring Simulation
• lac Operon Simulation
• Movement of substances across a semi-permeable membrane
• PhET Simulation- Lac Operon
• Battery-Resistor Circuit Simulation Homework II
• Energy Conservation Simulation Lab
• Graphing Activity using Gas Properties Simulation
• States of Matter Lecture Demonstration
• Das Hebelgesetz entdecken mit der Simulation Balanceakt
• Building Fraction Sense Using “Fractions Intro PhET Simulation”
• Seeing In Color Simulation
• Interactive Photoelectric Effect Lab
• Interactive Light and Color Lab
• PhET Interactive Lab on pH
• Video: Faraday's Electromagnetic Lab Simulation (PhET) Explained
• Lembar Kerja Siswa Berbasis Simulation Based Laboratory
• Fluid Pressure and Flow Phet Simulation worksheet
• Work and Energy Simulation Lab
• Phet Nuclear Fission Simulation Lab
• Simulation
• Neuron - an inquiry lesson idea
• Basic Electricity: short inquiry activities includes ideas for several sims
• Heat Flow
• Newton's Law of Universal Gravitation
• Projectile Motion
• Projectile Motion
• Masses and Springs Simulation Homework
• Microwaves Simulation Homework
• Moving Man Simulation Activity
• Sound Simulation Homework
• PhET Student Interactive Introduction on Capacitance & Dielectric Constants
• Instruction set in Photoelectric Expt.
• Blackbody Spectrum & Lasers Simulations Homework
• Electric Field Lab
• Forces and Motion: Basic - Concept Introduction
• Conservation of mechanical energy
• CONSERVATION OF MECHANICAL ENERGY
• Horizontal projectile motion
• Greenhouse Effect Worksheet
• Concentration - Clicker Questions
• Blackbody Spectrum Simulation Homework
• Microwaves Simulation Activity
• Greenhouse Simulation Lesson
• Video: Self-paced learning - Moving Man Simulation (Motion Graphs)
• Free fall
• Motion and Moving Man Simulation Homework
• Lab- Wave Simulation
• Density Simulation Lab
• Moving Man Simulation
• Lens Equation Experiment using Excel
• Explicando la selección natural (2º grado)
• PHET INTERACTIVE SIMULATIONS COMO FERRAMENTA NO ENSINO DE TERMODINÂMICA
• Molecule Polarity - Clicker Questions
• Isotopes and Atomic Mass - Clicker Questions
• Wave clicker questions (Inquiry Based)
• Molecule Shapes - Clicker Questions
• States of Matter Basics - Clicker Questions
• Balancing Chemical Equations - Clicker Questions
• Sugar and Salt Solutions - Clicker Questions
• States of Matter Simulation
• Build an Atom - Clicker Questions
• Wave Intro Simulation Worksheet
• Eating and Exercise Simulation Activity
• Natural Selection Simulation
• Energy Simulation
• Molarity Simulation
• Wavey Simulation
• Density Simulation
• Battery-Resistor Circuit Simulation Homework
• Linear Equations in Slope-Intercept and Point-Slope Form using “Graphing Lines PhET Simulation”
• Color Simulation
• Gas Simulation Remote Instruction
• Lab: Gas Laws Simulation
• Vector addition worksheet
• Gas Properties and Balloons & Buoyancy Simulations Homework
• Qu'est ce qu'un ion et comment interpréter sa formule ?
• Net force
• POGIL-style simulation analysis
• Balancing Act Homework Activity 1 and 2
• Coulombinc Force Simulation
• Energy Skate Park Basics - Clicker Questions
• Apples in 3 Baskets
• PHET energy forms and changes simulation worksheet to accompany simulation
• Saat Energi menjadi Jejak Petualangan untuk dijelajahi
• Understanding Planetary Motion using Kepler’s Laws
• Blackbody Radiation Activity
• Moving Man and Maze Game Simulations Homework
• Vectors Addition
• LC Lab with Simulation
• 2nd Law Simulation Lab
• Wave on a String Simulation
• Natural Selection Simulation
• D.C Circuit Simulation 1
• Nuclear Fission Simulation
• Natural Selection Simulation Activity
• Natural Selection PhET Simulation
• Concentration PhET Simulation Lab
• NGSS Simulation Alignment/Correlation
• Ramp Simulation Activity
• Cell Transport and Neuron Simulation
• Electrostatics Simulation lab
• projectile motion simulation
• Electromagnetic Generation - Phet simulation
• Build an Atom PHET Simulation
• Electric Fields Simulation
• States of Matter Simulation Lab
• PhET Faraday Simulation
• Gene Regulation Guided Simulation
• Gas laws simulation lab
• States of Matter Basics Simulation
• Natural selection simulation lab
• Electric Field Simulation Activity
• Bending Light Simulation Observations
• Plate Tectonic Simulation
• Energy Forms Simulation Activity
• PhET Simulation- Build a Molecule
• Eating & Exercise Simulation Lesson
• Coulombic Force Simulation Observations
• Series Circuit Simulation
• PhET Projectiles Simulation Lab
• Eating and Exercise Simulation
• Radio Waves & Electromagnetic Fields Simulation Homework
• Chemical Formulas PhET Simulation
• Gas Properties Simulation
• Area Model Intro Simulation
• Circuit Simulation Lab
• Effectuer une simulation laboratoire
• Rotational Equilibrium Simulation HW
• Laboratorio de Colisiones
• Explorando la gravedad y los péndulos
• Explorando la genética Mendeliana
• Dispersión de la luz
• Formas y cambios de energía
• Explorando la selección natural (9º grado)
• Stehende Wellen mit der Simulation Seilwelle erforschen
• Phet Simulation - Gases Intro Worksheet
• Gas Properties Modular Homework Activity
• Vector Addition 2: Understanding Force equilibrium (Inquiry Based)
• Spring Simulation - Identifying Variables & Asking Questions
• Discovering Beer’s Law by a Simulation-based Laboratory
• LR Lab with Simulation Part 1
• LR Lab with Simulation Part 2
• Projectile Motion Phet Simulation Activity
• Phet Alpha Decay Simulation Lab
• Phet Solar System Simulation Lab
• Gravity Force Simulation - Concept Questions
• Electric Circuits Simulation: Building Models
• Phet Beta Decay Simulation Lab
• Study Guide for lac Operon Simulation
• The Greenhouse Effect PhET Simulation Lab
• Energy Skate Park Student Simulation
• Energy Simulation Lab - Skate Park
• States of Matter - Lab Simulation - student procedures and questions
• Exploring the Relationship Between String Length and Period Using PhET Simulation
• Gas Properties Phet Simulation worksheet (AP Physics 2)
• Seeing Colors
• pH Scale Basics Remote Lab1
• Waves: Superposition (Inquiry Based)
• What is greater and less?
• States of Matter (Inquiry based) Phase Change and Phase diagrams
• Molecule Polarity
• Salts and Solubility 5 Activities in pdf
• Simple Inquiry-based Build an Atom Simulation Student worksheet
• Gene Regulation Exploration
• Optical Quantum Control_Optical Pulse Shaping_PhET
• Sound: An Introduction (Inquiry Based)
• A Projectile Motion-Introduction (Inquiry Based)
• Circuit Activity 2 Series & Parallel Circuits (Inquiry Based)
• Ramp Activity 1: Using free body diagrams for motion on an incline (Inquiry Based)
• Ramp Activity 2: Calculating Net force on an incline (Inquiry Based)
• Forces and Motion: Finding the Mass of a Car
• Circuit 1 Properties of Electric Circuits (Inquiry Based)
• D.C Circuit Simulation 2 - Series and Parallel
• Action Potential Simulation - Guided Inquiry Activity
• An Analysis of the Pendulum's Period Through PhET Simulation
• Neon Lights & Other Discharge Lamps: Lab Simulation
• Menyelidiki Gerak Proyektil dengan Phet Simulation
• States of Matter Guided Activity - PhET Simulation
• Exploring Pressure Underground with PhET Simulation Lab
• Phet Simulation: Energy Form--Intro(Heat)
• Isotopes and Atomic Mass Phet Simulation Guided Inquiry
• Energía potencial elástica, fuerzas y ley de Hooke
• Descubriendo la condición de equilibrio rotacional
• Explorando el pH de las sustancias
• Explorando el movimiento parabólico
• Kinetic and Potential energy
• Math in Motion
• Calculating Concentration
• Vector Addition 1: Introduction to vector math (Inquiry Based)
• Acid Base Solutions: Concentration and Strength
• Circuit Construction Kit- series of three activitites (Inquiry Based)
• FREE Auto-Graded PhET Activities on Wayground (Frm. Quizizz)
• Circuit activity 3 Combination Circuits using CCK only (Inquiry Based)
• Conservation of Energy using Masses and Springs (Inquiry Based)
• Graphing Quadratics
• Quadratic Functions for Projectile Motion
• Salts and Solubility 2: Solubility (Inquiry Based)
• Wave Representations (Inquiry Based)
• Inquiry-Based Learning Worksheet on Elasticity Using PhET Hooke’s Law Simulation
• Using the Reactions and Rates PhET Simulation: Concept Development Activity for Kinetics and Rates of Reactions
• Stern Gerlach clicker questions
• MRI lecture and homework
• Online Assignment 4 Ms & Ss
• Using the Molecule Polarity PhET Simulation: Concept Development for Understanding Molecular Dipoles
• Build an atom Periodic Table Virtual Lab
• Explicando la refracción de la luz
• Salts and Solubility 3: Solution Equilibrium and Ksp (Inquiry Based)
• Salts and Solubility 1: introduction to salts (Inquiry Based)
• Projectile Motion
• Conservation of Energy 1: Introduction (qualitative approach)
• Energy skate park
• Moving Man (Inquiry Based)
• Conservation of Energy using Masses and Springs (homework version) (Inquiry Based)
• Induction (high school version) (Inquiry Based)
• Sound_Inquiry for Middle School
• Magnets-Introduction (Inquiry Based)
• Organize it!
• Salts and Solubility 5: Designer Salts (Inquiry Based)
• Salts and Solubility 4: Using Q and LeChateliers Principle
• Discovering Newton's Second Law
• Activity in Mechanics (Collisions)
• Similar Triangles and Slope
• Gravity Force Investigation (PreAP)
• Circuit activity 3 Combination Circuits (Inquiry Based)
• Density Inquiry
• Investigating Waves
• Wave Particle Duality
• Forces and Motion activity 1: Predicting speed and directions changes (Inquiry Based)
• Parallel Circuit Electrical Relationships
• Forces and Motion: Tug O' War
• Fraction Matcher Game
• Balloons and Static Electricity | Remote Lab
• Circuit activity 2 Series and Parallel Circuits using only CCK (Inquiry Based)
• Arbeitsblatt Natürliche Selektion
• Using the Gases Intro PhET Simulation: Concept Development for Understanding Gas Laws and the Variable Changes Associated with Them
• Using the Coulomb’s Law PhET Simulation: Concept Development for Understanding Electrostatic Forces
• Using the Atomic Interactions PhET Simulation: Concept Development for Understanding Energy Changes Associated with Bond Forming and Bond Breaking Events
• Using the Molecular Shapes PhET Simulation: Concept Development for Understanding Molecular Geometry and Shape
• Projectile Motion Scientific Enquiry
• Exploring Mendelian genetics
• Induction (college homework version) (Inquiry Based)
• Sandwich Stiochiometry
• Natural Selection Lab
• Forces and Motion: Balanced and Unbalanced Forces, and Predicting Changes in Motion (Inquiry Based)
• Waves on a String (Inquiry Based)
• Molecular Geometry Flash Cards
• Vectors Worksheet
• Investigating Gas Properties with PhET
• vectors addition
• Charges and Fields Remote Lab Introduction to Static Electricity
• Sources of Variability - Investigating Projectile Data Lab
• Types of Forces Investigation
• Making Green Paint
• Masses and Springs: Energy
• Colors, Bunnies and Wolves: does the strongest survive?
• The Dance of the Planets
• Gases Understanding physical properties of gases (Inquiry Based)
• FARADAY'S LAW
• Water Polarity and Purification
• Momentum and Center of Mass
• pH Learning Goals by developement team (Inquiry Based)
• Projectile Motion Worksheet
• Solutions Unit Sample
• Questions on conservation of momentum
• Atoms 5: Isotopes
• Stimulation of a Neuron and the Resulting Action Potential
• Greenhouse
• Gravity and Orbits Investigation
• Waves on a String HTML5 PreAP Lesson
• Waves Intro | Remote Lab
• Energy Chains
• pH Scale Basics | Remote Lab
• 2-Point Source Interference Lab
• Build a Molecule
• Activity in Electricity and Magnetism (Resistor Networks and Kirchhoff's Rules)
• The Two-Slit Experiment
• Gravity Force Lab PreAP using HTML5 Sim
• Electricity Simulations Analysis
• Mixed Number Intro
• Isotopes and Atomic Mass
• Things you can show with 'My Solar System'
• Projectile motion
• Energy using Masses and Springs
• Vector Addition
• Why do objects float?
• Greenhouse Effect Guided Worksheet
• Gene Expression-the Basics
• How are greenhouse gases different from non-greenhouse gases?
• conservation of mechanical energy
• Electric Field Activity
• Time of flight related to initial speed in a horizontal projectile.
• Wave on a String Comparison
• Virtual Collisions Lab
• Capacitor Design Remote Lab
• Energy Skate Park Basics | Remote Lab
• Wave Interference
• Function Builder
• Energy Skater -- Introduction to Mechanical Energy Conservation
• Hooke's LAw
• Roller Coaster Creation
• La hauteur et la vitesse
• Conversation of Mechenical Energy
• Outlining Bonding vs. Shape Polarity
• The Invisible Balance: Investigating Mass–Distance Relationships in Levers
• Reactions and Rates: Learning Goals from the design team (Inquiry Based)
• In/Post-Class Worksheet, Wave Interference, Sound/Water, PhET
• Estimating the Length of Everyday Objects (Inquiry Based)
• Energy Skate Park Lab (html5)
• The sense and nature of electric current
• Student Guide for PhET - Concentration in html5
• Student Guide for PhET - Molarity in html5
• Student Guide for PhET - Ohm's Law in html5
• Quantum Wave Interference, 2 Lasers, PhET, Worksheet
• Student Guide for PhET - Acid Base Solutions in html5
• Investigating Kinetic Energy
• Student Guide for PhET - pH Scale in html5
• Coulombgesetz erarbeiten
• Using an Area Model to Multiply
• Introduction to Net Force
• In_Post Class Worksheet, Wave Interference, light, PhET.
• Student Guide for PhET - Molecule Shapes in html5
• Student Guide for PhET - Build an Atom in html5
• Calories Laboratory - simulate, compare, and uncover what BMI does NOT tell
• Student Guide for PhET - Balancing Act in html5
• Student Guide for PhET - Gravity and Orbits
• Force and Motion: Mass vs. Speed
• Student Guide for PhET - The Moving Man (JAVA) student guide
• Student Guide for PhET - Balancing Chemical Equations in html5
• Student Guide for PhET - Reactants, Products and Leftovers in html5
• Energy Skate Park Lab Questions
• Student Guide for PhET - Forces Motion in html5
• Plate Motions Lab Sheet
• Conductors and Insulators
• Energy Skate Park Basics Lesson
• Verification of Ohm's Law
• projectile motion
• Projectile Motion
• Projectile Motion
• projectile motion
• States of Matter Modeling
• Projectile Motion Exploration
• Exploring Gas Laws Using Data
• Newton's Gravitation Law
• Waves
• Producing Electromagnetic Radiation using a Neon
• Zderzenia - eksperyment symulowany
• Equipotential Surfaces Lab Activity
• vector addition
• Operon Modeling 2.0
• Vector Addition
• Electric Field Hocket
• Forces and Motion activity questions
• Ohm's Law
• Lenses and their Images
• Projectile Motion
• Greenhouse Effect
• Ohm's Law Graphing Lab
• Density Lesson (with Putty Lab)
• Hot Air Balloons Lesson
• Visualizing Current, Voltage and Resistance
• Models of the Atom
• Energy Flow Chart Lab
• vectors
• Gravity and Orbits Experimental Design Research Project
• Gas Laws
• States of Matter lab handout
• Boyle's Law
• Measuring Current in a Series Circuit
• Correlation vs Causation
• Phet Energy Forms and Changes Student Worksheet
• Projectile Motion
• Photoelectric Effect
• Building Atomic Models
• Investigate the Energy of a Pendulum
• Discharge Lamps & Flame Tests
• Natural Selection Lab Questions
• Force and Motion
• Forces and Motion Lesson
• The Effects of Resource Availability on Populations
• Natural Selection - 8th Grade Science
• Exploration du concept de concentration
• Introduction to Molarity and Dilutions
• Projectile motion
• Introduction to Ionic & Covalent Bonding
• NGSS Alignment Doc for High School targeted PhET Sims
• Moving Man Algebra uses
• Concentration
• In_Post Class Worksheet, Wave Interference, light, Slits, PhET.
• Projectile Motion Investigation
• Photoelectric Effect Phet Worksheet (AP Physics 2)
• Capacitors
• Blackbody spectra: Wien's Law and the Stephan-Boltzmann law
• Projectile motion and horizontal component of its velocity
• PhET Lab States of Matter Basics
• Density of Solids and Liquids
• Investigating Springs
• Introduction to Equivalent Fractions
• Wave on a String, No End, Pre/In/Post-Class Worksheet
• Newton's Laws and the Lunar Lander
• Satellite Motion Lab
• Online Vector Lab
• PhET Lab Energy Skate Park 2
• Exploring Ohms Law with DC Circuits
• Making Molecules
• Predicting the impact point in horizontal launch simulations
• Making use of the Sound Simulations
• Projectile Data Lab Exploratory Activity 1 of 2: Measurement with a Single Projectile
• Projectile Motion Lab Exploration
• Simple Pendulum
• Charges and Fields Exploration
• Exploring Newton
• Build a Molecule
• Reaktionsgleichungen ausgleichen
• Projectile Data Lab (with CODAP) Lab 1 of 3: Uncover the inner workings of mystery launchers
• Exploring Light as a Wave
• Circuit Builder: Parallel and Series Circuits
• Blackbody Spectrum
• Introduction to Projectile Motion
• Chemistry Theater
• Intrinsic Randomness
• Energy Skate Park
• Forces and Motion - Friction and Free Body Diagrams
• Current in DC Circuits
• Circuit Construction Kit
• Electric Field Hockey Post Activity
• Projectile Motion - Physics 1 lab experiment
• Projectile Data Lab (with CODAP) Lab 2 of 3: Firing projectiles as far as possible
• Guided Activity - Greenhouse Effect
• How does the mass and velocity of a satellite affect the orbit?
• Forces and Motion with Friction Group Activity
• Projectile Motion
• Projectile Data Lab Exploratory Activity 2 of 2: Measurement with a Set of Projectiles
• Vectors worksheet
• Identifying and Differentiating States of Matter
• Atomic models homework (Inquiry based)
• Energy Transformations
• Visualizing Resistance
• Tricky Dimensions – a Spin-off of a Sim
• Super Basic Gas Law
• Energy Skate Park Basics Student Guide [HTML]
• Refraction in Glass Blocks
• IMF and phase changes
• Properties of Air
• PhET Forces Lab
• Integer Addition and Subtraction Assessment
• Variables and Coefficients
• Deriving Gas Properties
• PhET Atom Simulator
• Isotopes
• Balancing equation
• The Covalent Bond Between Two Atoms
• Experimenting with forces (CER)
• worksheet about vectors
• Energy Skate Park Lesson
• What Type of Light Bulb Should I buy for my Grandma?
• Photoelectric, Light, and Quantum Worksheet
• circuits in parallel and in series
• 2.6 APES: Adaptation & Natural Selection
• Projectile Motion Virtual Lab Activity
• Discovering Acids and Bases
• Bunny Population Growth
• Density-introduction
• Ohm's Law
• High School Chemistry 1 level: Limiting reagents
• Projectile motion
• Finding Wave Properties
• projectile motion
• Bouncing Off the Walls
• Projectile Motion in Sports
• Comparing the properties of different materials
• Projectile Simuation
• vector addition activity
• Discharge Lamps and Electron Transitions
• How are products and factors related?
• Ripple While You Work
• Balancing Act : Menemukan Rahasia Keseimbangan melalui Jungkat-Jungkit Virtual
• Investigating Resistance in Circuits
• Quantum Wave Interference, PhET, Worksheet, High Intensity, Problems
• NUMBER LINE (DISTANCE)
• PhET: Color Vision | Remote Lab
• Atom Builder
• Projectile Data Lab (with CODAP) Lab 3 of 3: Advanced topics in measurement uncertainty
• Gene Expression and Protein Synthesis
• ORGANIC CHEMISTRY Chemical Reactions of Alkanes and Alkenes
• Wave Refraction
• Guided Exploration on Lac Operon Function
• Introduction to the Gas Laws using PhET simulations
• Stimulating Neurons
• Pressure in Liquids and Gases
• Newton's Second Law Investigation
• Science activity sheet: Acids_bases solutions
• Introduction to Vectors
• Graphing Energy at the Skate Park
• Circuits lab manual with experimental& theoretical value comparison
• Vector Addition Worksheet
• Introduction to the Buoyancy
• Investigating Electronegativity's Contribution to Molecular Polarity
• Energy Forms and Transformations: Mini-Challenges
• Projectile Motion
• Balancing Chemical Equations
• Exploring Area and Perimeter
• Investigating Gravitational Interactions
• Skate Park and Energy Conservation
• Friction Investigation
• Games in Net Force
• Hooke's law
• Modelling Molecular Polarity for High School Students
• ChemActivity: Phase Changes and Intermolecular Forces
• Natural Selection - 7.2 AP BIOLOGY
• Spring Oscillators Activity
• Introduction to the gas laws
• Natural Selection
• energy systems phet worksheet
• Projectile Motion Experiment
• Quantitative Representation of Natural Selection
• Exploring the density of mysterious objects
• Balancing Torques and Equilibrium
• Playing with atoms
• Wave Interference Lab: Path Difference impact on Constructive and Destructive Interference
• Direct Instructions for PhET Balancing Equations
• Group data generating activity to find Lac Operon effectiveness
• CD's, DVD's & Optical Commmunication: Binary Coding and Diffraction Errors
• Exploring Chemical Reactions and the Law of Conservation of Mass
• Light Emission and Lasers
• Modelling Motion
• Finding Unit Rates Using Addition, Subtraction, Multiplication, and Division
• Ohm's Law with Series and Parallel Resistors
• Memprediksi gerak benda dengan analisis Hukum Newton (Inkuiri)
• Modeling Paradigm Lab- 2nd Law
• Matching Fractions
• Exploring the pH Scale
• Climate Change - The Gas Phase