The "foam volume expansion" is defined as the ratio of:
Initial volume to final volume of foam
Final volume to initial volume of foam
Liquid volume to gas volume in the foam
Gas volume to liquid volume in the foam
Foam volume expansion is the ratio of the final volume of foam to its initial volume before foaming.
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5 g of Na2SO4 was dissolved in x g of H2O. The change in freezing point was found to be 3.820C. If Na2SO4 is 81.5% ionised, the value of x (K

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