What is coldness?

Coldness is what happens when something loses its warmth, just like a cup of hot chocolate gets cooler when you leave it on the table.

Imagine you're playing on a slide at the park. When it's sunny, the slide feels warm under your hands, that’s heat moving from the sun to the slide. But if it rains all day and the sky turns gray, the slide gets cooler. That’s because it lost some of its warmth, and now it feels cold.

Think about ice cubes in your drink. They start as water, but when they freeze, they lose their heat, that’s what makes them cold. It’s like the slide after a rainstorm: the more heat something loses, the more coldness it has.

So next time you feel a chilly breeze or touch a frozen cookie, remember, it's just something that lost its warmth, and now it’s full of coldness!