Double knitting is also called sport weight yarn and is not as thick as worsted weight. 2 ply wool is thinner than double knitting and is usually used for making socks.
No, Cascade 220 is worsted weight (a little heavier than DK).
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