the glorious heat

according to my form 4 textbooks,,
heat is defined as a form of energy transferred from hot body to cold body..body refers to anything that has mass..
temperature is defined as degrees of hotness of a body..again a body is everything that has mass.


the book teach about thermal equilibrium, specific heat capacity, specific latent heat and gas law..


there are lot more thing about heat..but these four are enough for now,, don't ask for more..

thermal equilibrium....
as heat is defined as energy transfer from hot to cold body..as every body has heat .. heat will flow from two body .. but hotter body will flow more heat to colder body...as hot body flow out more heat than it receive,,the net flow of heat is toward the colder body.

heat will flow continually between two body until thermal equilibrium is reached..which is the heat content and temperature of both body is the same and no net flow of heat between both bodies..

specific heat capacity...
total amount of heat in a body is affected by few factor which is ,
1.heat supplied to the body
2.the mass of the body
3.the types of the material

this means two body of the same type, mass and temperature has the same amount of heat in it..
this equate to

Q=mct

Q is the amount of heat
m is the mass
c is the type or specific heat capacity
t is the temperature..

this also means two body with same mass and type but different temperature has different amount of heat.
this also means two body with same mass and temperature but different type may have different amount of heat
this also means two body with same temperature and type but different masses has different amount of heat.

examples :
a glass of water at 30 celcius and a glass of water at 100 celcius has different amount of heat..
a glass of water at 100 celcius and a glass of oil at 100 celcius has different amount of heat.
a glass of water at 100 celcius and a jug of water at 100 celcius has different amount of heat.

from the equation Q=mct..the 'c' or specific heat capacity of an object is the amount of heat needed to raise the temperature of 1 kg of a substance by 1 degree celcius.

example of calculation :: energy required to increase temperature of 1 kg of water by 5 celcius is 21000 joules..from the following calculation. Q=1kg x 4200J/kgC x 5celcius.  
4200J/kgC is the specific heat apacity of water..

this means you would need 21000 Joules of heat to rise temperature of water by 5 degrees celcius.

I will continue about specific latent heat and gas law on another post..