The calorie is defined as 1 cal= 4.186 joule. Why cannot we round it off to 1 cal= 4 joule to make conversions easy?
Answer (1)
3rd Jan, 2022
We cannot round it off to 1 cal= 4 joules because there will be a significant error/ difference/discrepancy in work done (and hence the heat) needed to raise the temperature of 1g of water from 14.5 ̊C to 15. 5 ̊C (as work and heat are equivalent here, i.e. we need 4.186 J of work to be done to heat that amount of water to raise its temperature by one degree).
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