chapter 22

the reason you can hold your finger beside a candle flame without getting hurt is that ?

Air convects heat well , hot air rises, air is a poor heat conductor ,hot air convection currents upward .

a piece of paper wrapped around a thick metal bar will not ignite when touched with a lit match because ?

Energy goes to the bar , preventing ignition temperature .the bar keeps the paper relatively cool and the bar is slow to heat up.

plastic foam is a good heat --------?

Insulator

the reasons sea breezes are usually from the sea towards the land during the day is that.

Land is hotter than water , cool air high over the ocean flows downward , a high pressure area is created high above the water , a low pressure area is created just over the shore.

a good absorber of radiation is ?

a good emitter of radiation

the lower temperature is directly warmed by ?

absorbtion of terrestrial radiation

if you were caught in freezing weather with only a candle for heat , you would be in an ?

an igloo

if a volume of air is warmed ,it expands .if a volume of air expands it ----?

cools

suppose you want to save energy , and you're going to leave your house for a half hour on a cold day , you should turn the thermostat ?

down 10 degrees or more

energy transfer by convection is primarily restricted to ?

fluids

in a florist greenhouse , glass acts one way valve letting ?

high frequency light in and preventing low frequency radiation from escaping.

heat transfer by convection occurs when ?

large numbers of atoms move from place to place.

radiation from the sun often gas trapped in earths atmosphere. the reason for this is that .. ?

long wave length radiation is absorbed by the atmosphere.

if a poor absorber of radiation were a good emitter , it's temperature could remain ----?

lower than it's surrounding.

a piece of metal will feel colder than a piece of wood at the same temperature why ?

metal in general , have higher specific are good heat conductors.

a good reflector of radiations is ?

poor absorber of radiation.

infrared radiation is a form of ?

radiant energy

The metallic coating on the glass surfaces of a thermos vacuum bottle reduces the amount of energy transferred by ?

radiation

heat travels from the sun to earth by ?

radiation

planet earth loses heat primarily by ?

radiation

the reason light colored clothes help keep you cool in warm weather is that clothes of lighter cooler ..?

reflect a lot of energy

global warming by the greenhouse effect mostly results from the fact that an atmosphere with excess carbon dioxide is less transparent to ?

terrestrial radiation

two pots are filled with boiling water.the pots are exactly the same size but one pot is white and other is black. which pot cools faster.

the black pot

Which cools at the faster rate ,a bot of boiling water left at room temperature or a pot of lukewarm water the same size left in room temperature ?

the boiling water

Newtons law of cooling says that the rate of cooling depends on ?

the temperature difference between the object and it's surrounding.

at night , sea breeze results when ?

warm air over the shore rises and cooler air from the ocean take it's place.

a cup of hot coffee will cool faster ?

when black (:

Heat transfer by conduction in metals occurs when ?

when electrons bump into atoms and other electrons.

firewalkers who walk barefoot on red hot wooden coals depends on ?

wood's poor conductivity