Question

When we convert 1 calorie to joule we multiply by 4.186 why we not use 4 for quickly calculation ?? Give me suitable explanation...

Answer 1

Answer:

Instead of using 4.186 for converting calories to Joule you can use 4.2 only

THANK YOU

Answer 2

Answer:

Proper value is used for perfect calculations

YOU CAN ALSO USE 4.2 INSTEAD