It takes longer for a heavier car to stop than it does a lighter one. Velocity increases as mass increases in turn increasing the time needed to stop (trains, semi trucks).
it is lighter than water.
heavier because they are two different weights
Helium is lighter than air
carbon dioxide is heavier than oxygen therefore oxygen is lighter.
Depends on the solute: alcohol in water is lighter, salt in water is heavier than water.
LIGHTER
Just, simply, Lighter than Air Vehicles are lighter than air, so that makes them fly, and Heavier than air vehicles are heavier than air, but they use airfoils on the wings to fly.
meson is heavier than electron but lighter than proton
Nitrous Oxide is heavier than air.
rhenium
hydrogen
Xenon is more than 4.5 times heavier than air.