The actual volume of fruits can be measured by water displacement method (WDM). The WDM is one of the most common and simple means of measuring the volume of large objects such as fruits and vegetables (Mohsenin, 1970). The procedure is as follows: the fruit is first weighed on a scale and then dipped into water with a sinker rod. The weight of the displaced water is then calculated by subtracting the weight of the water-filled container from the weight of the container when it contains the fruit. The
resulting value is then used to calculate the volume of the fruit by using (Mohsenin, 1970):