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Some can - because they are designed to be able to spread their weight (displacement) over a wide enough area that can be supported by the bottom of the vehicle and sealing the bottom of said vehicle, along with re-routing exhaust/intake. Most don't float because they are not designed to.
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How does a raft float?
A raft is very buoyant, and displaces very little water, the material it is made from is lighter than water, which makes them float very well.
What is the heaviest substance that will float in water?
All substances will float on water if you engineer them into a thin enough flattened out sheet and curve the edges up slightly as to displace enough water such that the weight of that volume of water that is displaced is heavier than the constructed piece of material.
What is the density of most of construction materials?
Does it float or does it not float? If it floats it is lense dense than water, 62.4 lbs/cubic ft. Wood is about 40 lbs/ cu.ft.--it floats. Concrete is 150 lbs. / cu.ft. -- it does not float.
How did the bull float get its name?
A Bull Float got its name because it is the first float used on concrete and other surfaces to get the first water off and begin to smooth the surface. The term Bull refers to the fact they are large and rather clumsy to use.
How a toilet 'knows' when to stop filling the tank?
Toilets use float valves. These are air filled balls that float on the water, as the cistern fills with water the ball floats higher. The ball is attached to an arm connected to a valve, when the ball reaches a predefined level the valve closes, shutting off the water to the cistern.
