nawilżenie in English:

hydration - the process of making your body absorb water or other liquid

If your windows are not airtight, moisture will seep in.

If you watch the sun setting on a warm, damp day, you can see the moisture changing the shape of the sun.

to protect from moisture

The air was heavy with moisture.

a material that is designed to absorb/retain moisture

It’s hot and there’s a lot of moisture in the air. It feels humid.

Your collar has a bit of moisture.

Bottles Keep the container tightly closed in order to protect from moisture.

As for the air, there is always some moisture in the atmosphere, but when the amount increases a great deal, it affects the light waves.

Plant growth and productivity react sharply to a complex combination of temperature and moisture.

Yes, it is. There's a lot of moisture in the air.