.

112 QUANTITATIVE AGRICULTURAL ANALYSIS

Substituting the value of C,

8

= cal per gm.

(3)

The water equivalent may be calculated from the known
weights and specific heats of all of the parts of the calorii»<3t>or
but it is better determined experimentally by burning a X>TLU*°
substance of known heat of combustion, such as naphthaJone
or cane sugar.

jl

'?!

» r |

•q

i ' .' i i ;
• It 'i'^i

L ^