HomepageHomepage Showcase


Weather experiment learning about fog

Posted at 6:02 AM, Apr 22, 2020
and last updated 2020-04-22 11:50:35-04

GRAND RAPIDS — We have all seen fog give a very erie look and feel to many days. How does fog form and what is it exactly? Fog sure can be creepy sometimes and can even give us issues with decreases in visibility. Today's weather experiment will show and teach us all about it so lets get started!

What you need:
- Glass jar
- Water
- Ice cubes
- Matches
- Plastic sandwich bag

Step 1: Fill up jar completely with hot water for about a minute

Step 2: Pour out almost all the water, but leave an inch or so in the jar

Step 3: Light the match and hold it over the jar for a few seconds before dropping it in the jar

Step 4: Very quickly place the few ice cubes in the plastic bag over the jar

Step 5: Watch what happens!

We just created fog! The cold air from the ice cubes collides with the warm, moist air in the jar causing the water to condense and form the fog!

The vapor started to form because the warm water and the match heated the air inside the jar. The warm, moist air rose up to the top of the jar colliding with the cold air just below the ice cubes. When the warm air meets the cold air they create a cloud of water droplets.

Fog is actually a cloud….clouds can form at many different altitudes as high as 12 miles above sea level or as low as the ground. So fog happens when the air right at the surface level cools enough to turn into water vapor.

There you have it, we just created fog! Send our meteorologist Candace Monacelli your pictures doing this experiments at home! She will feature future meteorologists on my Facebook page daily!