A calorie is defined as the amount of heat required to raise the temperature of unit quantity of water from ##13.5## degree centigrade to ##14.5## degree centigrade. It is nearly equal to ##4.18## J.
##1## kJ is equal to ##1000## J. (Since the prefix k or kilo coveys ##10^3##).
So
##504 J= (504/ 4.18) cal =120.574 ## ##cal##
##504 #### J= (504/1000) kJ = 0.504 ## ##kJ##
##192## ##cal= (192xx4.18) J = 802.56 J= 0.802 ## ##kJ##
##0.423## ##kJ= (0.423xx1000)J= 423 J= (423/4.18)## ##cal= 101.196 cal##
So
## 4.18 J= 4.18xx 10^-3 kJ= 1 cal##
## 1J= 1xx10-3 kJ= 0.239 cal##
