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).
heavier because they are two different weights
Helium is lighter than air
tungsten is more more heavier han the lead as it has great mass in less volume
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.
rhenium
hydrogen
One is lighter and the other one is heavier. :D
Tritium is lighter than deuterium. Tritium is a hydrogen isotope with one proton and two neutrons, making it heavier than regular hydrogen but lighter than deuterium, which has one proton and one neutron.
Nitrous Oxide is heavier than air.
It is way lighter than after you start eating it