Question

Calorie is defined as the amount of heat required to raise the temperature of 1g of water by 1°C and it is defined under which of the following conditions?

(a) From 14.5°C to 15.5°C at 760mm of Hg

(b) From 98.5°C to 99.5°C at 760mm of Hg

(c) From 13.5°C to 14.5°C at 76mm of Hg

(d) From 3.5°C to 4.5°C at 76mm of Hg

I got this question during an online exam.

This intriguing question originated from Thermal Expansion topic in portion Thermal Properties of Matter of Engineering Physics I

Answer 1

The correct choice is (a) From 14.5°C to 15.5°C at 760mm of Hg

Easiest explanation: One calorie is defined as the heat required to raise the temperature of 1g of water from 14.5°C to 15.5° at 760mm of Hg.