Question

The unit of heat in SI is Joules and in mkgs its Calorie. That means Joules > Calorie, But how doest 1cal = 4.18 joules

Answer 1

Thus the “15° calorie” (also called the gram-calorie, or small calorie) was defined as the amount of heatthat will raise the temperature of 1gram of water from 14.5° to 15.5° C—equal to 4.1855 joules. ... A unit of heat energy used in thermochemistry is the thermochemical calorie, equal to 4.184 joules.