Question

while deciding the unit for heat which temperature interval is chosen why

Answer 1

The choice of temperature interval is not dependant on the unit of heat. In SI units the heat is measured in joules and in the CGS unit the heat is measured in calories.

The unit of heat is independent of the temperature interval and temperature gradient. The direction of heat flow can be measured with the temperature of two different bodies.

There is no particular desired temperature at which the heat can be cut off. 

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Answer 2

While defining the unit for heat, the temperature range between 14°C to 15.5°C is chosen.

If we take different temperature range than 14°C to 15.5°C, the amount of heat required will be slightly different. It is, therefore, essential to define a specific temperature range while.

defining the unit of heat.

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