Question

define one calorie of heat​

Answer 1

Answer:

The calorie was originally defined as the amount of heat required at a pressure of 1 standard atmosphere to raise the temperature of 1 gram of water 1° Celsius. Since 1925 this calorie has been defined in terms of the joule, the definition since 1948 being that one calorie is equal to approximately 4.2 joules.

Answer 2

Answer:

1 Calorie heat is defined as the amount of heat required to change the

temperature of 1 gram of pure water by 10°C.

Since 1925 this calorie has been defined in terms of the joule, the definition since 1948 being that one calorie is equal to approximately 4.2 joules.

Explanation:

Because the quantity of heat represented by the calorie is known to differ at different temperatures (by as much as 1 percent), it has consequently been necessary to define the temperature at which the specific heat of water is to be taken as 1 calorie. Thus the “15° calorie” (also called the gram-calorie, or small calorie) was defined as the amount of heat that will raise the temperature of 1 gram of water from 14.5° to 15.5° C—equal to 4.1855 joules.

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