Rain in a Jar

By | February 21, 2014

Rain in a Jar

My oldest daughter had her friend over a couple weeks ago and she requested that I do something fun like when we did our egg in a bottle experiment.  I did not have any experiments planned for the day, so I had to come up with a fun science experiment quick.  That is when I thought about making it rain in a jar.

This one was easy for me since I already had everything on hand and it is a quick project to put together last minute.  I guess my daughters friends are starting to expect to do fun stuff every time they come over now so I better start being more prepared!  This would be a great experiment to do with the kids on a rainy day, that way they can make their own rain inside.

All the girls had fun watching the rain form in the jar, the older two wanted to know how it did that.  So I explained about warm air meeting the cold air at the top of the jar and then it forming condensation.  We talked about how the windows get all fogged up in the car during winter because it is so warm in the car and cold outside.  I like to try and make things simple for the kids to understand, and give them some examples of things that they see happening around them.

What is happening with this experiment?

The warm air in the jar (caused by adding the hot water) rises to the top of the jar where the ice cools it.  The water vapor then condenses and forms precipitation (water droplets).  In our jar you can see the precipitation on the sides of the jar, outside the precipitation falls to the ground as rain/water droplets.

This is the same process that causes rain outside.  Warm air rises and meets the cooler air in the atmosphere and then condenses to form precipitation and then falls back to earth as rain.

Check out some of our other Fun Science Experiments HERE.


Hot Water


Add warm water to jarFill your jar about 1/4 full with hot water

Put a plate filled with ice ontop of jarFill your plate with ice and set it on top of your jar

watching it rain in the jarNow watch as condensation forms in your jar, essentially making it rain!

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9 thoughts on “Rain in a Jar

  1. Bonnie a.k.a. LadyBlogger

    Uh oh…It sounds like you’re getting a reputation with your daughter’s friends! You’d better start making a list of
    “go-to” experiments and have the supplies on hand! Pinned, like many of your others, to my “education” board on Pinterest!

  2. Brittnei

    They look like they are in such awe! I love this experiment! I’m pinning for later! Thanks for sharing it with us at Countdown in Style! Don’t forget to stop by Friday to see if you are featured!

  3. April

    Very cool, Tracey. I need to prepare for more experiments. I love them. This is a great explanation of how rain works. Thanks for sharing and linking up with Countdown in Style.

  4. Susan

    How fun and facinating. Can’t wait to share this with my son. Thanks for sharing at Inspire Us Thursday on Organized 31.


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