Particles are always moving. In a solid they vibrate; in a gas they fly about.
Step 1: Something to Notice
Watch first. The explanation comes later.
Bend a paperclip back and forth twenty times and it becomes noticeably hot. Nothing was added to it.
Where did the heat come from, if nothing went in?
Step 2: Find Out
Add energy and watch the temperature respond.
Step 1 — Predict
A paperclip gets hot from being bent. What was added to it?
Choose what you think will happen. You cannot see the experiment until you do — guessing first is what makes it worth watching.
Step 3: So Here Is Why
Now the explanation, after you have seen it happen.
Temperature measures that motion
The faster the particles move on average, the higher the temperature.
Temperature A measurement of the average motion of particles.
Heat is not a substance
Nothing flows into a bent paperclip. Energy is transferred, and the particles move faster.
And it is an average
A tiny spark can be hotter than a bath and hold far less energy, because there is much less of it.
Temperature measures how fast they move
Temperature is a measure of the average kinetic energy of the particles. Heating something means making its particles move faster, which is why hot gases expand.
It is an average
At any temperature some particles move much faster than others. That spread is why evaporation happens below boiling point — the fastest particles escape while the average stays put.
Step 4: A Common Mistake
Lots of people think
“Heat is a substance that flows into things and makes them hot.”
Step 5: Temperature Is an Average, Not a Total
The same idea somewhere new.
A spark from a firework can be over a thousand degrees and cannot burn you, because it is tiny. A bath at forty degrees holds far more energy in total. Temperature tells you how fast the particles move on average; how much energy there is depends on how many particles there are as well.
Step 6: Think It Through
Practice makes it stick.
The Bent Paperclip
Problem 1 of 2
A paperclip gets hot from bending. What was added?
Spark and Bath
Problem 2 of 2
A spark is 1000 °C and a bath is 40 °C. Which holds more energy in total?
What Temperature Is
1 of 4
What does temperature measure?
2 of 4
Is heat a substance?
3 of 4
Which holds more total energy?
4 of 4
Do particles stop moving in a very cold solid?
Step 7: Quick Check
Show what you know.
Question 1 of 1
What is temperature?
Step 8: Explain It in Writing
Claim, evidence, then reasoning.
The question
A bent paperclip gets hot with nothing added to it. Explain what happened.
Words to useenergytransferredparticlesfasteraverage speedsubstancework
Fill in all three boxes. The reasoning box is the one that matters most.
What You Found Out
- Particles are always moving, in every state.
- Temperature measures their average speed.
- Heat is not a substance — energy is transferred and the particles move faster.
- Temperature is an average, so a tiny spark can be hotter than a bath and hold less energy.