The density of materials depends on the temperature.
Oil IS already less dense than water.
That depends on the specific situation. Assuming the liquids just mix, and don't have some other reaction: * Adding water to a liquid that is denser than water will result in a liquid that is less dense (than the liquid that is not water). * Adding water to a liquid that is less dense than water will result in a liquid that is more dense.
The hydrogen bonds between water molecules make ice less dense than water.
Heavy rainfall makes water less dense because an increase in salinity leads to an increase in density. Rain does not contain any salt. Therefore heavy rainfall makes ocean water less dense. =)
A 3 Musketeers bar floats on water because it is less dense than water. The ingredients in the bar create air pockets or bubbles, which make it less dense and able to float.
I would think it would make it less dense since it evaporated, because it pratically diappeared.
For an object to float it must be less dense than the water/liquid that it's in. Adding sugar to water lowers its density because glucose molecules (sugar molecules) are less dense than water molecules. Therefore, putting an object into sugar water will make it sink.
No, because oil is less dense than water so it would float it wont even stay in the middle because its not equivalently dense.
Particles do make objects denser than they normally may be. For example, if you add particles of salt to water, the water will become more dense. Alternately, if you filter impurities out of water it will become less dense.
Apples are 25% air which makes them less dense then water.
More dense, however the effect that evaporation has on the oceans is negligible due to their sheer size.
salt makes the water denser, so things that are now less dense than the salt water will float