they are equal weight of course
water
dirt
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.
If the weight of the object is greater than that of an equal volume of water, it'll sink. People build boats out of concrete - it's a common assignment in civil engineering classes. If the boat will displace 1000 gallons of water but it weighs less than 8000 pounds...it'll float.
Concrete
dry concrete
Wet concrete weighs about 4,000 per cubic yard. Some types of concrete weigh more or less. Lightweight concrete weighs about 1,000 pounds less.
Wet concrete weighs approximately 4,000 pounds per square yard. That amount varies depending on the water content. Lightweight concrete weighs about 1,000 pounds less.
they are equal weight of course
concrete 2400 Kg/m3aluminun 2712 Kg/m3
water
water
Steel is heavier than concrete for the same volume, however steel buildings are generally lighter. This is because steel buildings utilize high strength of steel, so volume of steel in steel buildings is much smaller than volume of concrete in concrete buildings. In another words in steel buildings much less volume of material is needed for the same strength compared to concrete buildings.
Wetlands
Water is heavier
dirt