Liquids are very useful.

Have you ever tried drinking a cake? Of course you can't!
That's because cake is not a liquid. You can only drink a liquid.

Some well known drinkable liquids are:

Water
Juice
Milk
and Orange Juice

But some liquids are the opposide of drinkable - undrinkable!

They are able to make your mouth ache, and your face melt.

The most deadly liquid can do both of these things, plus it will kill you! Bonus!

It's a liquid known as an acid!