Exercise 5 : Question 4 (71)

While deciding the unit for heat, which temperatures interval is chosen? Why?
→ While deciding the unit for heat, the temperature interval from 14.5ºC to 15.5ºC is chosen. The reason for this is as follows: If we heat 1 kg of water by 1ºC in different temperature range than 14.5ºC to 15.5ºC, 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.2 Marks