Sponge Control Volume
Sponge Control Volume
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Sponge Density Experiment?
I'm trying to find out whether sponges of different densities affect the amount of water absorption.
Can you please list detailed steps of any method i could use to answer my aim? And list the apparatus? how many sponges should i use? how do i calculate the volume and density of the sponges? Please list all the CONTROLLED variables. 
please please help
THANKS
Controlled Variables are what you are controlling. So since your uncontrolled is density, then everything else is controlled. This would be like the amount of water, the temperature of the water and the air, the type of sponge (yes, type), etc.
The amount of sponges you use should be at least 3 however you should also run multiple trials on those sponges (say, 3 per = 9 total) so that human error doesn't occur.
If anything, you should really considering learning what density is. : If you're too lazy, it's mass/volume. You should measure the sponges on an electric balance and let it absorb water from a beaker or tub that already has a set amount of water. So, measure the water and use this L of water for all your trials. To measure how much water was absorbed, take a container (e.g. beaker) and place it on the electric balance and reset to zero (so when the beaker is on the balance, it says zero). Then, place the sponge into the beaker and record the total mass. Take this mass and subtract the mass of the sponge alone. You will get the mass of the water and that should be sufficient enough.
I dont really want to list the apparatus and steps all nicely because I kinda just explained it above so just clean that up and you should be good to go.
and if you are required, make sure you jot down uncertainties.
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