In a micro gravity, if the mass of each are equal they would 'weigh' the same.
Because the density of the cotton is less than that of the water. It weighs less.
Oil is slightly less dense than water and a litre of water weighs a kilogram. It would be less than a kilogram, but by how much depends on the type of oil.
it basicly depends on the quantity: if there is more water and less bricks then the water weighs more if there are more bricks than water then the bricks weigh more if the bricks and water are in equal amount, then if the water is really dense it may weigh more... it varies
Sand and water both have weight and both have volume. A cup (volume) of sand weighs more than an equal volume of water. So the sand pushes the water out of the way and sinks. A cup of wood chips weighs less than an equal volume of water. So the water pushes the wood chips out of the way and they float. Try it and see.
false
You haven't said "more or less" than what. He weighs more than a beach ball and less than a manatee. Everybody weighs less in water than they do out of it. But every person weighs more than some other people and less that some other other people, whether any of them are in or out of the water.
It's less dense
yes cuz oil weighs less than water
No, cold water weighs more (for a given volume) than hot water. This is why there is a thermocline in bodies of water. But when water freezes, the solid form weighs even less (for a given volume), this is why ice floats.
1.5 gallons of water does that. 1.5 gallons weighs 50% more than 1 gallon. If you reduce it 50%, you have 0.75 gallon, and that weighs less than 1 gallon.
maybe.