1. BASICS OF CALORIMETRY

2. heat energy – joules – SI unit temperature – kelvin, 0C – SI unit
BASICS OF CALORIMETRY
UNDERSTAND UNITS
heat energy – joules – SI unit
temperature – kelvin, 0C – SI unit
mass kg – SI unit
CONVERSION
1 calorie = J (or) 4.2 J
HEAT IS NOTHING BUT AN ENERGY
HEAT FLOWS FROM A BODY OF HIGHER TEMPERATURE TO A BODY OF LOWER TEMPERATURE
what is definition of calorie? Try to visualise it.
1 kg of water
Heat energy required to raise 1 kg of water by 10C
What does this mean? If I have 1 kg of water at 150C, I require 4200J of heat energy to raise it to 160C

3. FACTORS AFFECTING THE QUANTITY OF HEAT REQUIRED TO RAISE THE TEMPERATURE OF A BODY
MASS -- IF THE MASS OF A SUBSTANCE IS MORE, I REQUIRE MORE HEAT TO RAISE ITS TEMPERATURE TO A GIVEN VALUE
DIFFERENCE IN TEMPERATURE -- IF THE DIFFERENCE IN TEMPERATURE IS MORE (i.e) 20 DEGREES TO 80 DEGREES, I REQUIRE MORE HEAT WHEREAS IF THE DIFFERENCE IS LESS (i.e) 30 DEGREES TO FIFTY DEGREES, I REQUIRE LESS HEAT.
DEPENDS ON THE MATERIAL -- IF THE LIQUID IS WATER, MORE HEAT IS REQUIRED, IF THE MATERIAL IS OIL, LESS HEAT IS REQUIRED

4. HEAT CAPACITY OR THERMAL CAPACITY
THEREFORE H = mC T
THEN WHAT IS THE UNIT??
H – JOULES/CALORIES
m – g (or) kg
DIFFERENCE IN TEMPERATURE = DEGREES C (OR K)
THEN WHAT IS THE UNIT OF SPECIFIC HEAT CAPACITY?
C = H = JOULES = Jg C-1 (or) J g -1 K-1
m T Gk
HEAT CAPACITY OR THERMAL CAPACITY
IT IS THE HEAT REQUIRED TO RAISE A GIVEN MASS OF A SUBSTANCE BY ONE DEGREE CENTIGRADE

5. SPECIFIC HEAT CAPACITY
IT IS THE HEAT REQUIRED TO RAISE UNIT MASS OF A SUBSTANCE THROUGH ONE DEGREES CELSIUS.
LEAD HAS A SPECIFIC HEAT CAPACITY OF 130 Jk g -1 K-1WHAT DOES IT MEAN?
IF I HAVE 1 KILOGRAM OF LEAD AT (SAY) 100C, I REQUIRE 130 JOULES OF HEAT ENERGY TO RAISE IT TO 110C.
(OR)
IF I HAVE 1 KILOGRAM OF LEAD AT (SAY) 120C, I SHOULD REMOVE 130 JOULES OF HEAT ENERGY TO LOWER IT TO 110C.
WHY IS COPPER USED AS A CALORIMETER?
HOW DOES THE HEAT TRANSFER IN A CALORIMETER IS PREVENTED?