2.4. Measurement of gas production
The gas holder was calibrated with the aid of a rule marked 7 in
the Fig. 1 to enable the reading of the daily gas production from the
Lemon grass digested. The volume of biogas produced was measured
each day shortly before sunset, by computing the volume
of the gas holder floating over water level in the water jacket.
The base area of the gas holder is expressed by Eq. (2):