Eggs are amazing! Today we investigated the principles of OSMOSIS and DIFFUSION so that we can better understand what is happening in more experiments we have planned. Did you know eggs have a membrane inside the shell?
This membrane allows some substances to pass through while keeping other substances out. This is called osmosis. We experimented with this idea by mixing salt and lentils and then passing them through a sieve to simulate the membrane. Only the tiny particles of salt were able to pass through the sieve.
Next we looked at diffusion. We put a couple of drops of food colouring into a glass of water and watched. When first dropped into the water, the part of the water that shows colour has a high concentration of food colouring. Over time, the colour begins to spread throughout the water to areas with no colour (low concentration of food colouring). Eventually, the colour is evenly spread throughout the entire glass of water.
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