Advertisements
Advertisements
Question
Decide the unit for specific heat capacity.
Advertisements
Solution
- The amount of heat (Q) required to change the temperature of a substance is directly proportional to:
a. the mass of the substance (m).
b. change in temperature of the substance (ΔT).
∴ Q ∝ m and Q ∝ ΔT
∴ Q ∝ mΔT
∴ Q = cmΔT ....(1)
where ‘c’ is specific heat or specific heat capacity of a substance. From equation (1),
c = `"Q"/("m" Delta "T")` ....(2) - SI unit:
As SI unit of heat is J, mass is kg and change in temperature is °C, SI unit of specific heat capacity is J/kg °C - C.G.S. unit:
As CGS unit of heat is calorie, mass is g and change in temperature is °C, CGS unit of specific heat capacity is cal/g °C
APPEARS IN
RELATED QUESTIONS
A geyser heats water flowing at the rate of 3.0 litres per minute from 27 °C to 77 °C. If the geyser operates on a gas burner, what is the rate of consumption of the fuel if its heat of combustion is 4.0 × 104 J/g?
Calculate the mass of ice needed to cool 150 g of water contained in a calorimeter of mass 50 g at 32 °C such that the final temperature is 5 °C. Specific heat capacity of calorimeter = 0.4 J g-1 °C-1, Specific heat capacity of water = 4.2 J g-1°C-1, latent heat capacity of ice = 330 J g-1.
Write the approximate value of specific heat capacity of water in S.I. unit.
Two metallic blocks P and Q of masses in ratio 2: 1 are given the same amount of heat. If their temperature rise by the same amount, compare their specific heat capacities.
Explain the term boiling ?
Name three fossil fuels that emit carbon dioxide into the atmosphere ?
How does green house effect help in keeping the temperature of earth’s surface suitable for living of human beings?
(i) State whether the specific heat capacity of a substance remains the same when its state changes from solid to liquid.
(ii) Give one example to support your answer.
Does the specific heat capacity of a substance depend upon its mass and rise in temperature only?
Some heat is provided to a body to raise its temperature by 25°C. What will be the corresponding rise in temperature of the body as shown on the Kelvin scale?
If, in a central heating system, steam enters a radiation pipe at 100°C and water leaves the radiation pipe at 100°C, can this radiation pipe heat a room? Give an explanation for your answer.
Why are athletes advised to put on extra clothes after competing on event?
The SI unit of specific heat is _______.
All metals have the same specific heat capacity.
Two metals A and B have specific heat capacities in the ratio 2 : 3. If they are supplied the same amount of heat then
Which metal piece will show a greater rise in temperature given their masses is the same?
The specific heat capacity of water is ______.
Thermal capacities of substances A and B are same. If mass of A is more than mass of B then:
Which substance will have more specific heat capacity?
Two blocks P and Q of different metals having their mass in the ratio 2 : 1 are given same amount of heat. Their temperature rises by same amount. Compare their specific heat capacities.
Which method is used to determine the specific heat capacity of both solids and liquids by mixing a substance of unknown specific heat with water?
