Idea 1of 9Builds onWarmth is where it went
How hot
A bath and a cup read the same. Same what?
Today you'll discover
- what a thermometer actually measures
- why a bath and a cup can read the same
- the word for that reading
Think firstA bath and a cup of water, the same reading
A thermometer reads the same in a bathtub and in a cup. What is the same?
Decide first, then press Next. Watch the side axis, not the bottom one.
A graph with energy added along the bottom and the reading up the side, empty at first. After a prediction, the side axis is named in degrees, then a sloping piece of the curve shows the reading rising as energy is added, and the reading is named. The last step asks why a very hot spark does not burn.
See the whole ideathe big idea and the key word, in one place
The big idea
Temperature is a reading: how fast, not how much.
Compare themTemperature: the average jiggle per particle, in degrees. Thermal energy: the total, in joules. A bath at forty holds far more than a cup at forty.
Key word
- temperature
- a measure of the average kinetic energy of a substance's particles; what a thermometer reads, in degrees
About this modelDrawn to scale: boiling costs about seven times what melting costs, per kilogram.
Drawn to scale: boiling costs about seven times what melting costs, per kilogram.
Ready to use it?
- Say what a thermometer reading does and does not tell you about two objects.