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Do Pumpkins Sink or Float?

October 24, 2009 by notjustcute Filed Under: Celebrate!, Get Outside, Learning through Play and Experience 4 Comments

wet pumpkin ckolezal

Sink or float is a classic preschool activity.  You gather an assortment of items and have the children guess which will sink or float, and then test their hypotheses.  (It made me laugh not too long ago when David Letterman added a gag segment called “Will it Float” with a huge pool of water and random items for the members of the audience to make predictions about.  I’m guessing he’d been to his little boy’s preschool the day he came up with that one!) 

This fall, consider adding pumpkins to your list of items to test.  What do YOU think?  Sink or float?  You may need a larger bin  for testing pumpkins (I’ve used a bath tub in the past), but it will be well worth it.  You may want to just add a pumpkin to the list of other items you usually test, or you may want to do an exclusive pumpkin test. 

Gather a variety of sizes of pumpkins.  Talk with the children about which is the biggest, smallest, etc. and even line them up in order (great math work here).  Then have the children share their hypotheses about each pumpkin.  Will it sink or float?  Why do they think that way?

Are you still wondering if they float?  They do!  In fact, I once used a huge, 25 pound pumpkin, and it still floated!  (They don’t float on top of the water, obviously, but they bob with about 1/3-1/2 of the pumpkin above water.) 

Many children will think that your mini pumpkin will float, but that the huge pumpkin they can’t even lift will not.  Talk – very briefly- about density.  Density is what makes something sink or float, not weight.  It’s about how the weight is spread out.  Sometimes I even make the connection between balloons and pumpkins, floating both in the water for the visual effect.  They are both made up mostly of air on the inside.  Having more empty spaces makes something less dense and that makes it easier to float.

Now I certainly don’t expect each child to come away knowing that an object must have a density of less than 1 gram per cubic centimeter in order to float.  But I think it doesn’t hurt to expose them to the vocabulary and concepts, to get them thinking and applying in future situations.  This activity obviously builds science  knowledge, but perhaps more importantly than building specific knowledge about floating and density, is that it gives the children experience with the scientific method.  As they ask questions, make hypotheses, test their hypotheses, and discuss their findings, they’re learning how to learn!  And that’s a skill that always keeps kids on top!

For more favorite fall activities, click here!

Photo by cdolezal.

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Comments

  1. 4

    Katie says

    December 2, 2018 at 9:24 am

    It doesn’t have to do with the fact that pumpkins are hollow. I assumed that too… Cut them open and see what happens. Try it with cooked pumpkin chunks too.

    Reply

Trackbacks

  1. Five Fun Ways to Serve Up Some Pumpkin! « Not Just Cute says:
    October 25, 2010 at 5:38 am

    […] before that a pumpkin’s greatness is in part due to its hollowness. We’ve talked about floating pumpkins, pumpkin drums, and of course, Jack-o-lanterns, but perhaps best of all, a pumpkin can be hollowed […]

    Reply
  2. Will it Float? Simple Graphing for Preschoolers « Not Just Cute says:
    October 29, 2010 at 2:55 am

    […] I did a sink or float activity (because no matter how many times we do it, my boys still think that 20 pound pumpkins will sink) and I used the back of the door for our graph.  Just a door and some painter’s tape.  […]

    Reply
  3. Thematic Unit: On the Move with Transportation « Not Just Cute says:
    November 10, 2010 at 2:53 am

    […] Water and objects for Sink or Float Experiments […]

    Reply

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I’m Amanda Morgan. Here’s what I’m about…

In early education, there is too much distance between what we know and what we do. I bridge the gaps that exist between academia, decision-makers, educators, and parents so that together, we can improve the quality of early education while also respecting and protecting the childhood experience.

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