practice test on heat Flashcards
which of the following is an example of heat conduction: a. An air vent in a furnace sending hot air into the house b. A metal cup heating up when hot water is poured into it c. the sun melting ice formed on a frosty lawn d. cool air sinking to the ground on a cold night
b. a metal cup heating up when hot water is poured into it
in a room in the winter time where would you find the warmest air: a. in the corners b.by a window c. near the ceiling d. near the floor
c. near the ceiling
by what process does heat energy travel from the sun to the earth: a. heat is radiated through space b. heat is conducted through air molecules c. convection of heat through the air currents d. heat travels through the wind
a. heat is radiated through space
why are metals good conductors of heat: a they bend easily b. they can melt at low temperatures c. their molecules are closely packed d. they have pockets of air in them
c. their molecules are closely packed.
how is heat created
heat is created by moving molecules when the molecules in a substance move faster the substance has more heat energy.
what is conduction
heat transfer by touch is called conduction. when heat is transfered in solids it is through conduction
what is radiation
heat transfered by electromagnetic waves is called radiation. Radiation can travel through empty space
what is convection
convection is heat transfer in liquids, and gasses. hot water or air rises and cold water or air sinks. this happens because hot air is less dense, and cold air is more dense.
hot air balloon rising in the air
convection
warming up by a fire
radiation
getting a sunburn
radiation
the furnace heating your house
convection
a lizard warming itself on a hot rock
conduction
scrambled eggs cooking on a frying pan
conduction
stepping on cold tile floors in the bathroom
conduction
