What is Heat?

Vaporization that takes place only at the surface of a liquid is called

evaporation

Heat is not transferred

from cold to hot

freezing

liquid to solid

Conductors

metal, copper, aluminum, silver

What are good conductors of heat?

metals

melting

solid to liquid

A change in phase from a sold to a gas

sublimation

Heat depends on

temperature and mass

Temperature

the average kinetic energy of particles in a substance

Vaporization

the change from a liquid to a gas

Explain no such thing as cold

Cold is the absence of heat

How many states of matter exist on Earth?

Solid, liquid, gas

What is the boiling point of water

100 degrees Celsius

thermal expansion

An increase in the size of a substance when the temperature is increased

Radiation

Energy that is radiated or transmitted in the form of rays or waves or particles.

condensation

Gas to liquid

When a substance gains kinetic energy...

It gains heat.

Conduction

The direct transfer of heat from one substance to another substance that it is touching.

Absolute Zero

The coldest temperature, 0 Kelvin, that can be reached. It is the hypothetical temperature at which all molecular motion stops.

kinetic energy

energy of motion

Why do objects expand when they are heated?

The molecules are moving faster and are moving away from each other causing the object to increase in volume.

freezing point

The temperature at which a substance changes from a liquid to a solid

boiling point

The temperature at which a liquid changes to a gas

Convection

The transfer of thermal energy by the circulation or movement of a liquid or gas (currents)

insulators

Wood, plastic, and rubber are all good

A rise in temperature means

a change in the motion of the molecules

heat

a form of energy caused by the internal motion of particles

Insulation can

prevent heat loss or gain

Absolute zero

when no more energy can be removed from matter