Like a good science, physics is there!

But first, we shall do SCIENCE!

THank you, Safeway employees, for not kicking me out while I took photos of the fruit.

A few moments of research and we know the following:

There are 14 types of fruit available in Puzzle Pirates
- bananas, coconuts, limes, mangos, pineapples, carambolas, durians, passion fruit, pomegranates, and rambutans
They all have the same mass and volume per "unit" of fruit, namely:
- 125 kilograms
- 100 liters
Water has a standard mass and volume, namely:
- 1 liter of pure water has a mass of 1 kilogram

Now, we can convert these numbers to cubic meters quite easily using the formula that one cubic meter equals 1000 liters. This means that, in Puzzle Pirates, one cubic meter of any fruit has a mass of 1250 kilograms. Plugging those numbers into our density formula (density equals mass over volume), we arrive at our result:

Fruit has a density of 1250 kilograms per cubic meter, while water has a density of 1000 kilograms per cubic meter.

There's something fruity about those numbers...