Re: how can i find out how much water is in an apple?

You would need a balance to first weigh the apple to determine the fresh weight
in grams. Then you would need to have an adult help you slice the apple into
thin slices and dry them in an oven at about 60 degrees Celsius (140 degrees F)
until they are completely dry. Then weigh them again to determine the dry
weight. Then you calculate the percent water in the apple as follows:

(fresh weight - dry weight)/fresh weight x 100

For example, if fresh weight = 100 grams, and dry weight = 15 grams, then water
content = (100-15)/100 x 100 or 85%. 

You can also look up an estimate for the percentage water in an apple on the
internet.

References


Re: What estimated percentage of water is in various fruits and vegetables?


USDA National Nutrient Database