Here are our results for the #TheoryEgg experiment.
In our first attempt the egg sunk to the bottom of both the tap water and salt water:
We decided to add some more salt (quite a lot actually) to our salty water and here is what happened:
Here is an explanation about what happens to the water when salt is added, it explains that the water’s density changes when salt is added to it (explaining density to Millie was a bit tricky so this video helped a lot):
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This theory was given to us by the awesome Raewyn Rowney ( Si’s mum). Raewyn has been a teacher for almost 40 years and is the most resourceful person I know, so we are very lucky to have her help us out with our experimenting ideas.
The theory we are trying to figure out is that eggs float in salt water. Here is my explanation of the theory that eggs float in salt water, and Millie’s hypothesis:
So she thinks they will float. Here are a few hints to help you with your own science experiment:
To ensure our experiment had controls we –
used the same sized glasses to make sure the experiment was consistent, and so it couldn’t be argued that it was the glass that made the egg do whatever it was going to do
put the egg in a glass of normal tap water, as well as a glass of salt water
used the same egg in both normal water and salt water
did the experiment several times with different eggs to make sure it wasn’t just one egg that did whatever it was going to do
