Question

How much heat does water require to absorb for the temperature of one gram to increase $ 1 $ degree Celsius?
(A) $ 4.184 $ Joules
(B) $ 4.194 $ Joules
(C) \[4.174\]Joules
(D) $ 4.164 $ Joules

Answer 1

Hint: Water has to absorb $ 4.184 $ Joules of heat for the temperature of one gram of water to increase $ 1^\circ C $ . The specific heat is defined as the amount of heat required to raise the temperature by $ 1^\circ C $ of unit mass.

Complete answer:
The amount of heat required to raise the temperature of $ 1 $ gram of water through $ 1^\circ C $ , is called $ 1 $ calorie.
And $ 1calorie = 4.184joule $ ,
Or
The amount of heat $ Q $ supplied to mass $ m $ of a substance to raise its temperature through $ \Delta t $ is given by
 $ Q = mc\Delta t $ ,
Where $ c = $ specific heat of substance,
Given, $ m = 1g,\Delta t = 1^\circ C $ and we have $ c = 1cal.g/^\circ C $ (for water),
Hence, $ Q = 1 \times 1 \times 1 = 1calorie $ .
Now,
 $ 1calorie = 4.184joule $

So, the correct answer is “Option A”.

Additional Information:
Factors that affect rate of heat flow include the conductivity of the material, temperature difference across the material, thickness of the material, and area of the material. Difference materials have greater or lesser resistance to heat transfer, making them better insulators or better conductors.

Note:
Heat is the transfer of kinetic energy from one medium or object to another, or from an energy source to a medium or object. This is the amount of heat required to raise the temperature of one pound of pure liquid water by one degree fahrenheit. Conduction is the way in which energy is transferred from a hot body to a cooler one. The rate of heat transfer depends on the material through which heat is transferred. The effect of a material upon heat transfer rates is often expressed in terms of a number known as the thermal conductivity.