Question

The amount of heat needed to increase the temperature of $1\text{gm}$ of water from ${14.5}^{\circ }\text{C}$ to ${15.5}^{\circ }\text{C}$ at one atmosphere is

• A. $1\text{calorie}$
• B. $4.2\text{calorie}$
• C. $1\text{joule}$
• D. $42\text{calorie}$

Answer 1

The correct option is A $1\text{calorie}$

$1\text{calorie}$ is defined as the amount of heat needed to increase the temperature of $1\text{gm}$ of water from ${14.5}^{\circ }\text{C}$ to ${15.5}^{\circ }\text{C}$ at one atmosphere.
$1\text{calorie}=4.18\text{joules}$