Heating homes Flashcards
what is a thermogram?
a picture that uses colour to indicate the hottest and coldest parts
what is temperature a measure of? and on what scale?
it is a measure of hotness on an arbitrary scale
what happens to the particles when the temperature of the body increases?
the average kinetic energy of the particles increase
what is heat a measure of? and what scale is it measured on?
heat is a measurement of internal energy. It is measured on an absolute scale
what is SHC?
The energy needed to raise the temperature of 1kg by 1 degree
what is SHC measured in?
joules per kilogram degree celsius (J/Kg degree celsius)
what is SLH?
the energy needed to melt or boil 1kg of the material
what is SLH measured in?
joule per kilogram
Explain why their is no change in temperature when a substance is heated?
because energy is needed to break the bonds that hold the molecules together
what is heat measured in?
amount of energy
what Is the unit of energy?
joule
what is temperature a measure of?
the average kinetic energy of the particles
what if heat a measure of?
the total internal energy of an object
what can the energy needed to change the temperature of a liquid be measured by?
using an electrical immersion heater connected to a joulemeter
what is latent heat?
the heat needed to change a state without a change in temperature
which is better a low U value or a higher U value and why?
lower because less heat is transferred
what it temperature a measure of?
how hot something is
what would cool down faster:
a room at 50 degrees above room temp
or a room at 5 degrees above room temp
a room at 3 degrees
what might cold solid objects do?
melt
what graph would be best to present how a temperature cools down to room temp?
curved from top right to bottom right
what would happen if you put an ice cube on your hand?
your hand would get colder because energy flows from a warmer to a colder body
what happens when an object is heated and its temperature rises?
energy is transferred
why is there no change in temperature when a substance changes state?
because energy is needed to break the bonds that hold the molecules together
