Thermal Power Vocabulary Slides
Physical Science • Energy Unit
11 Core Scientific Terms
Vocabulary Mastery Deck
Thermal Energy & Scientific Inquiry
Explore how particle motion, heat transfer, and controlled experiments help us understand thermal phenomena.
Matter & Particles
Scientific Variables
Heat & Equilibrium
Vocabulary Roadmap
11 Key Concepts
Building Blocks
Physical composition of our universe.
- 1. Matter
- 2. Particle
- 3. Mass
Inquiry Tools
Designing fair scientific experiments.
- 4. Independent Variable
- 5. Dependent Variable
Heat & Flow
Thermal energy & heat transfer.
- 6. Thermal Energy
- 7. Temperature
- 8. Conduction
- 9. Insulator & Conductor
- 10. Equilibrium
Tip: Focus on both the scientific definition and the real-world lab connection! Part 1 • Foundations
Term 01 Building Blocks of Science
Matter
Formal Scientific Definition
Anything that has mass and takes up space (volume).
Every solid, liquid, and gas you see, touch, or breathe is made of matter. Light and sound are energy, not matter!
Is it Matter?
Hot cocoa liquid Matter
Warmth from the cup Energy
Invisible steam & air Matter
• Remember: If it takes up room and has weight, it is matter!
Discussion Prompt: Name 3 things in your classroom that are matter and 1 thing that is not.
Term 02 Microscopic Foundation
Particle
Formal Scientific Definition
A tiny piece of matter (such as an atom or a molecule) that is too small to be seen without specialized instruments.
All matter is composed of particles that are always in motion. They vibrate, rotate, and collide constantly!
Particle Motion Rule
Cold Substance
Particles move and vibrate slowly and stay closer together.
Hot Substance
Particles move and vibrate rapidly and push farther apart.
Heat = Faster Particle Motion!
Think & Gesture: Can you act out particle motion in ice vs. boiling steam?
Term 03 Measuring Matter
Mass
Formal Scientific Definition
The measurement of the amount of matter (number of particles) that makes up an object.
Typically measured in grams (g) or kilograms (kg) using a balance or electronic scale.
Thermal Connection
100 mL Hot Water
Fewer particles • Less total thermal energy.
Warm Swimming Pool
Enormous mass • Massive total thermal energy!
More Mass = More Particles = More Heat Capacity
Key Contrast: Mass is how much matter exists; weight is gravity pulling on that mass.
Checkpoint 1: Quick Concept Check
Active Practice
Scenario
Two metal blocks made of copper sit on a lab counter.
Block A has a mass of 200 grams. Block B has a mass of 50 grams. Both blocks are at room temperature (22°C).
Q1
Which has more particles?
Explain your reasoning using the words matter and mass.
Q2
Particle Motion
Since both are 22°C, are the individual particles moving at the same average speed? Why or why not?
• Turn & talk to your elbow partner for 60 seconds before sharing out! Ready to reveal answers?
Term 04 Scientific Inquiry & Labs
Independent Variable
Formal Scientific Definition
The variable that the scientist intentionally changes or tests in an experiment.
Memory Hook:
"I change the Independent variable to see what happens!"
Thermal Lab Example
Investigation Question:
"Which type of cup (paper, plastic, or foam) keeps hot water hot the longest?"
Independent Variable:
The Material of the Cup
Plotted on the X-Axis of a graph!
Golden Rule: A fair experiment changes only ONE independent variable at a time!
Term 05 Scientific Inquiry & Labs
Dependent Variable
Formal Scientific Definition
The variable that is measured or observed; it depends on and responds to the independent variable.
Memory Hook:
"Dependent variable is the Data you collect!"
Thermal Lab Example
Investigation Question:
"Which type of cup (paper, plastic, or foam) keeps hot water hot the longest?"
Dependent Variable:
Water Temperature (°C)
Plotted on the Y-Axis of a graph!
Formula Sentence: How does [Independent Variable] affect [Dependent Variable]?
Variables Challenge: Lab Spotting
Partner Challenge
Experiment
Heating Water Volumes
A student heats three different volumes of water (50 mL, 100 mL, and 150 mL) on identical hot plates set to medium heat. Every minute for 10 minutes, the student uses a digital probe to record the water temperature.
Target A
What is the Independent Variable?
What did the researcher purposely change between trials?
Target B
What is the Dependent Variable?
What was measured and recorded as numerical data?
Bonus Question: What is one controlled variable that must stay identical? Answer: Hot plate setting!
Term 06 Thermal Dynamics
Thermal Energy
Formal Scientific Definition
The total kinetic energy of all the moving particles that make up a substance.
Because it is the total energy, thermal energy depends on two factors: how fast the particles are moving (temperature) AND how many particles there are (mass).
The Two Drivers
1
Particle Speed
Faster movement = more energy
2
Number of Particles
More mass = greater total energy
Total Energy = (Avg Energy per particle) × (Number of particles)
Mind Boggler: A freezing ocean has much MORE thermal energy than a boiling cup of tea!
Term 07 Thermal Dynamics
Temperature
Formal Scientific Definition
The measurement of the average kinetic energy of the individual particles in an object.
Temperature does NOT depend on mass or how much of the substance you have! A single drop of boiling water has the exact same temperature as a giant pot of boiling water (100°C).
The Big Showdown
Temperature
AVERAGE particle speed.
Size of object doesn't matter.
Thermal Energy
TOTAL particle energy combined.
Size and mass DO matter!
Standard SI Unit: Celsius (°C) or Kelvin (K)
Key Takeaway: Temperature tells you how fast particles move on average!
Term 08 Heat Transfer Mechanisms
Conduction
Formal Scientific Definition
The transfer of thermal energy between substances that are in direct physical contact through particle collisions.
Fast-moving particles in the warmer object bump directly into slower-moving particles in the cooler object, passing kinetic energy along like a chain reaction!
Real-World Conduction
Metal Spoon in Soup
Heat travels from hot broth directly up the handle into your hand.
Bare Feet on Cold Tile
Heat conducts rapidly from your warm soles into the chilly floor.
Direct Contact = Conduction!
Direction of Flow: Heat ALWAYS transfers from WARMER objects to COOLER objects!
Terms 09 & 10 Material Properties
Conductor
Passes Heat Fast
A material that allows thermal energy to transfer through it easily and rapidly.
Prime Examples:
- Copper, aluminum, silver, iron
- Metal frying pans & radiators
Particles closely packed • Collisions occur easily
Insulator
Slows Heat Down
A material that resists and slows down the transfer of thermal energy.
Prime Examples:
- Foam, wool, rubber, wood, fiberglass
- Winter coats, cooler boxes, oven mitts
Traps air pockets • Slows particle collisions
Kitchen Design: A frying pan uses a metal conductor base with a wooden or silicone insulator handle!
Term 11 The Balance of Nature
Equilibrium
Formal Scientific Definition
A state of balance when objects in contact reach the same temperature, so no net heat transfer occurs.
Whenever two objects of different temperatures touch, thermal energy will flow from the hotter object to the cooler one until they reach thermal equilibrium.
Path to Balance
Hot Coffee (85°C)
Placed in room at 20°C
Heat conducts into the room air
Final Equilibrium (20°C)
Coffee and room are at identical temps!
Net heat transfer stops at equilibrium!
Think About It: Why does an ice cube in a soda melt until the drink reaches equilibrium?
Rapid Recall: Name That Term!
All 11 Terms
1
"The total kinetic energy of all particles combined in a body of matter."
• Thermal Energy
2
"The variable that the scientist records as experimental data."
• Dependent Variable
3
"Heat transfer through direct particle-to-particle collisions."
• Conduction
4
"The state where two objects in contact reach equal temperatures."
• Equilibrium
Classroom Activity: Call out the term as soon as the clue is read aloud!
Mastery Check • Quick Write
Exit Ticket Prompt
Your Final Challenge
Write a short, 3-sentence scientific paragraph describing what happens when you place a cold metal spoon into a hot bowl of soup.
Must include at least 4 of these terms:
particle conduction conductor thermal energy equilibrium
Key Takeaways
- Matter is made of vibrating particles with mass.
- Heat always flows from hotter to colder matter.
- Flow continues until thermal equilibrium is achieved.
Great Job Mastering Thermal Energy!
Thermal Energy • Physical Science Vocabulary Mastery 16 / 16 Slides
