HEAT AND TEMPERATURE
3 ways to move heat:
Convection: movement of heat through currents of gas or liquid (sea breeze, land breeze)
Conduction: movement of heat by fast moving molecules hitting slower ones and speeding up the slower ones (while losing some of their wiggles in the process)
conductors take or give wiggles (holding something cold in your hand, metal spoon)
insulators keep things the same temperature (wearing a coat, wooden spoon)
Have kids design something to keep hot water hot for as long as possible (or give them ice cubes and see whose stays solid after end of a specific time.)
Radiation: movement of heat energy indirectly through light (rescue blankets)
When something rises, it cools. ex: top of mountain
Convection: movement of heat through currents of gas or liquid (sea breeze, land breeze)
Conduction: movement of heat by fast moving molecules hitting slower ones and speeding up the slower ones (while losing some of their wiggles in the process)
conductors take or give wiggles (holding something cold in your hand, metal spoon)
insulators keep things the same temperature (wearing a coat, wooden spoon)
Have kids design something to keep hot water hot for as long as possible (or give them ice cubes and see whose stays solid after end of a specific time.)
Radiation: movement of heat energy indirectly through light (rescue blankets)
When something rises, it cools. ex: top of mountain
![Picture](/uploads/2/3/0/3/23036350/1421915.png?315)
Land Breeze vs. Sea Breeze
Land breeze (Night at the beach)
cold sand, medium ocean
Sea breeze (Day at the beach)
hot sand, medium ocean
![Picture](/uploads/2/3/0/3/23036350/1380735490.jpg)
Density of Hot and Cold Water
- Luke warm water in tub
- 2 baby food jars with holes in lids (1 with cold, blue water and 1 with hot, red water)
- Place jars in water and the cold (blue) one leaks out and lays on bottom of container, but hot (red) one floats up to surface of the container. (Hot only comes out of top hole, cold only comes out of bottom hole.)
- Cold water is more dense so it lays on bottom. (water molecules are more tightly packed)
- Hot water is less dense so it floats to top. (water molecules are less tightly packed)
- The red and blue water form layers, do not mix.
![Picture](/uploads/2/3/0/3/23036350/21470.jpg?203)
Make a Thermometer
- glass bottle, water, modeling clay, straw, red die
- Fill glass bottle half full of water and put 4-5 drops of die in it.
- Place straw in bottle and without crushing or pinching it, seal the top with modeling clay to prevent any air leaks.
- Place hands on bottle or place in a window sill to heat.
- Observe the red water going up the straw, acting as a thermometer.
![Picture](/uploads/2/3/0/3/23036350/2821109.jpg?198)
When you heat something, the mass stays the same, but the space gets bigger so the molecules have more room to move.
That is why things get less dense when they get hot.
Big Misconception: Molecules do not get bigger, they just heat up, move faster, and take up more space.
That is why things get less dense when they get hot.
Big Misconception: Molecules do not get bigger, they just heat up, move faster, and take up more space.