How to know the watermelon is ripened?
how?
Tap on the watermelon gentry with your thumb or see finger. Which ever watermelon makes more sound (hallow) is the most ripened among the others.
Why?
In the ripened watermelon, the water content(juice) is more than flesh. In the riping process, the flesh of the water melon will be converted to water content. Where as in unriped water melon, the water content is lessor than the riped. That is why well ripped watermelon sounds much hallow than the unripened.
You can correlate this theory with a water filled bucket sounds more than sand filled bucket.