Why Does Sea Water Taste Salty But Rain Doesn't?

The Ocean is a Soup

Imagine the ocean is like a pot of soup that has been boiling for billions of years. Every time rain falls down from the clouds, it is like fresh water being poured into a filter. It does not carry much flavor with it.

Where Does Salt Come From?

Salt starts in rocks on land. When rain hits the ground, it is slightly acidic. This weak acid acts like a tiny spoon scooping up minerals like sodium and chlorine from dirt and stones. The water carries these invisible grains down rivers to the sea.

Why Doesn't It Get Sweeter?

The ocean gets bigger with salt, but the rain never adds more than it takes away in other ways. When the sun heats the ocean, pure water turns into gas and floats up as clouds. The salt stays behind because it is too heavy to float. So, the water goes up as clean vapor, but the salt remains down below. This is why a cloud tastes like nothing, but the sea tastes like a salty pickle.

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Examples

  1. A child tastes rainwater from a hose and finds it plain compared to a sip of ocean water.
  2. Boiling salted pasta water leaves behind hard crusty residue while the steam rises clear.
  3. Rivers flowing into the sea look like fresh streams but carry invisible minerals to the ocean.

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