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

Options

A. From `14.5^(@)C " to" 15.5^(@)C` at 760 mm of Hg
B. From `98.5^(@)C " to" 99.5^(@)C` at 760 mm 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 76 mm of Hg

Answer

A

Explanation

1 calorie is the amount of heat required to raise the temperature of 1g of water form `14.5^(@)C "to" 15.5^(@)C` at 760mm of Hg. Hence correct option is (a)