# What is the heat capacity of water?

Chemists say the isobaric, mass heat capacity is $\approx 4.184 \frac{J}{g \cdot K}$ (because we like ${25}^{\circ} \text{C}$), and physicists say it is $\approx 4.186 \frac{J}{g \cdot K}$ (because they like ${20}^{\circ} \text{C}$).
An easy way out of this is to just say $1 \frac{c a l}{g \cdot K}$, since 1 calorie raises one gram of water by ${1}^{o} C$, or $1 K$ (same interval).
I tend to use $4.184 \frac{J}{g \cdot K}$ as a chemist, but whatever the case, if you use a specific one, know what temperature you are at.