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