An air cooled car will be lighter.
The air cooled engine has a single thin walled engine block for air cooling just like an air cooled motorcycle or early VW Beetle. There is no antifreeze, radiator, water pump, hoses, etc, that a water cooled car would have.
The water cooled engines have two walls (an inner wall for the pistons, etc, and the outer wall to hold the water) to help carry the water around the hot spots of the motor so you have twice the metal plus the weight of the water, etc. There's probably 200lbs to 300lbs savings.
The water cooled engine will typically be heavier, because you have to add in the water pump, the radiator and the water/coolant. The engine block itself may be lighter as there are passages drilled out for the water/coolant to flow through.
lighter
it is lighter than water.
It tends to, yes. But if the steam condenses onto the cake (in the form of water when cooled), then it will actually make the cake a bit heavier.
Depends on the solute: alcohol in water is lighter, salt in water is heavier than water.
A porous object absorb water and is heavier. In air the water is evaporated and the object become lighter.
hevier
salted water
No water is heavier then oil.
depends if the plastic is heavier or lighter than water and if its hold air which is lighter than water
Hurrdy dur
Coal can be heavier or lighter than water depending on its type. Most types of coal are heavier than water in terms of density, however, broken bituminous coal has only a density of 0.833 kg/m3, so it is lighter than water.