Heat Transfers

Question 1

Density

Answer 1

Measures how much mass there is per unit volume in a material

DENSITY= MASS (g/kg) ➗VOLUME (cm3 or m3)
Units of density are either: g/cm3 or kg/m3
Weird P = density = mass divided by volume

Question 2

Flow of heat energy from hot to cold areas

Answer 2

Anything WARMER than room temperature will TRANSFER ENERGY to the surroundings and become COOLER
anything COOLER than room temperature will GAIN ENERGY from the surroundings and WARM UP

Question 3

Conduction

Answer 3

Process of transferring thermal energy through SOLID materials

1. Metals are very good thermal conductors because they have free electrons
2. The electrons gain thermal energy and vibrate more
3. They move through the metal (or object) and collide with other atoms , causing them to vibrate more.
4. The energy is quickly spread through the metal.

Question 4

Thermal insulators

Answer 4

Bad thermal conductor = insulator
Air is a very good insulator
Woolly clothes keep us warm as they trap pockets of air
Air prevents heat loss by conduction