Why does soap cake sink in water but soap cake in a plastic plate float?

Answer 1

Water striders have structures on their leg surfaces that trap air and hence increase the buoyancy of the leg such that the whole insect can float on water. Soap molecules have two ends, one end is hydrophilic (water attracting) while the other end is hydrophobic (not water attracting). Hydrophilic molecules tends to stick to other hydrophilic molecules and hence do not stick to hydrophobic molecules as much. The hydrophobic molecules also tends to be attracted to other hydrophobic molecules.

Water does not intrude into the air filled structures on water strider legs because the legs themselves are also hydrophobic. Water does not stick to the surface of the legs but the hydrophobic end of the soap molecule does. The hydrophobic end of the soap molecules replace the air trapped on the surface of the strider legs while the hydrophilic (water attracting) end completes the bridging of water to the strider leg surface making the strider leg also hydrophilic and losing its buoyancy.

Answer 2

The dish soap is more dense so it sinks to the bottom when in gel form. When in bubble form it is less dense so floats.

Answer 3

it goes up your dick, around it, then comes out again because its too small to hold it

Answer 4

The density(specific gravity) of soap cake is greater than 1, therefor it sinks. Whereas the density(specific gravity) of soap cake with plastic plate become less than 1, therefor it float.