Why Does A Cold Glass Of Water 'Sweat' On A Hot Day?

Tools

By By Steve Pool

SEATTLE - Say it's a hot day, and to beat the heat, you go inside and grab a nice glass of lemonade. But a few minutes later, the glass is coated with water drops. Why?

The first steps to understand are that the air always has tiny droplets of water vapor in it, and that warmer air can hold more water than colder air.

In our example, the lemonade will cool the glass it's in, which in turn will cool the air immediately around the glass.

As that air near the glass cools, it can't hold as much water vapor, so the water changes from its water-vapor gas state to its liquid form, which you see as water drops clinging to the glass. That process is called "condensation."

Your Photos

YouNews 8yr Pure Athleticism, Talent and Heart 8yr Pure Athleticism, Talent and Heart
My son Keoni Bananola Lamar is 8yr old. The video is when he was 6yrs. He started doing flips on a trampoline in his grandma back yard when he was 5yr. From the first time he got on the trampoline I knew he was fearless.
YouNews Sunset on Rainier Sunset on Rainier
As my friend and I were headed back from an adventurous day of hiking up Summit Peak and Summit Lake in the Carbon river area of the park, we came into a little clearing just in time to see a beautiful sunset on Mount Rainier and the lenticular cloud that had just formed just above it.