2.3. Relative density of the batter
The relative density (RD) of the batter was measured with a
calibrated density cup of known volume. After mixing, the cup was
filled with batter just up to brim level, and then the filled cup was
weighed. The same procedure was conducted with water as the
filler. The RD was determined gravimetrically by dividing the
weight of this known volume of batter by the weight of an equal
volume of water. Measurements were performed in duplicate.