Why do watermelons crack, split and explode?
When it comes to summer time, nothing beats a good slice of juicy pink watermelon. They decorate signs and posters and all types of summer related items. In the heat they represent coolness, sweetness and something to take the warmth away for a few minutes.
Of course, when you buy a big green and white striped watermelon from the shop and then take it home, you are looking forward to a delicious bite. Your mouth waters, you wish the lights would change as you anticipate the great taste.
You get home and put it on the counter. You run off to put down your stuff when you hear a strange sound. You return to the kitchen and find... a cracked watermelon lying innocently on the counter, its guts splattered around the kitchen. So the question you ask is ...
Why did my water melon explode?
The simple answer? Your water melon was rotten.
If you were lucky, it didn't smell. If you were unlucky it might have really stunk!
The complicated answer? As soon as a fresh plant is removed from its host plant or reaches maturity, it begins to very slowly break down. Heat accelerates this process.
As it breaks down, a colorless gas called acetylene forms inside the water melon. The gas is volatile and quite unstable while in gas form (which is why when it's used in scientific experiments it's usually used in liquid form.)
The gas will try its best to escape the water melon but as it slowly increases due to the rotting in the water melon, the pressure will continue to increase.
When the skin of the watermelon is no longer strong enough to hold the gas inside, it will explode, often spraying all nearby surfaces with rotten water melon.
Sometimes a trip home from the shop in a warm car is the final catalyst required to create an explosion.
How can I avoid a rotten watermelon?
There is one guranteed way to avoid taking home a rotting watermelon that might shower the interior of your house.
Buy a cut water melon or request that the shop owner cut it before you buy it.
This way you can make sure it's in satisfactory condition before you take it home - just remember to keep it as cool as possible on the trip back to your house.
How can I make a water melon explode?
It's a bad idea to try to recreate an exploding water melon. It's possible to recreate an explosion with a chemical procedure but this involves volatile gases and liquids.
Ask your chemistry or science teacher - they may know how to do it and be willing to recreate the exploding water melon for your class!