Egg in Saltwater

egg in saltwater

I love ridiculously easy science experiments.  I don’t want to create a shopping list just to do something with my kids.  I know, sometimes it is worth.  But most times I just want to grab a few things around the kitchen and be done.

Materials:

  • egg
  • salt
  • water
  • glass or bowl

This is a great activity to do after “sink or float.”  Hypothesize if an egg will float in water.  Test the hypothesis.  Then add salt and try it again.  Hint- you have to add LOTS of salt!  How does it work?  A raw egg has more density than tap water.  Adding salt increases the density of water until at some point it is greater than the egg.  Then the egg floats.  Try the experiment with other materials.  Talk about swimming in saltwater vs. freshwater.

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Sink or Float Experiment

sink or float

One of the easiest science experiments is “Sink or Float.”  Just gather up some stuff on your living room floor and toss it in a bowl of water.  Done.  Science.

Okay, you could probably make it a little more educational.

First, make some predictions (hypotheses) about the objects.  An easy way to do this is group them into “sink” and “float” piles.  For older kids, make a chart of the objects, hypotheses, and actual results.  You can make your own or print one from the handy internet.

Next, the fun part.  Test the objects in water.  This is a hit with all ages.  Who doesn’t love dropping things in water?

Then, discuss the results and draw conclusions.  Ah, the learning part.  Were your hypotheses correct?  What do the sinking objects have in common?  What makes an object float?

simple sink or float

I always like to follow up an experiment with a good book.  Check out library books with a 532 call number or try some of my favorites:

  • Magic School Bus Ups and Downs: A Book about Floating and Sinking  by Joanna Cole
  • What Floats?  What Sinks?  A Look at Density by Jennifer Boothroyd
  • Will it Float or Sink? (Rookie Read-About Science) by Melissa Stewart

And if your library seems oh-so-far-away, try this equally educational online video.  Plus it’s interactive!!

 

Celery Experiment

celery experiment

The celery experiment.  Do it.  It’s easy and it’s fun and it’s SCIENCE!  A million other people have done it (and taken better pictures), but here are the cliff notes:

  1. Go to the grocery store and buy celery.  I hear they sell it there.  What it is doing there among the normal people food?  Do people actually eat it?  I guess they don’t have a science experiment store.
  2. Fill a glass with water and a few drops of food coloring.
  3. Cut off a stalk of celery and put that bad boy in the cup.

And there you go.  You’re officially a scientist.  Now you get to use big words like “hypothesis” and “observation” and jot things down in your notebook.  I’m sorry, I meant OBSERVATION journal!

The National Science Teachers Association website has a wonderful scientific explanation of the experiment and follow-up questions that you can discuss with your child.