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.
One is lighter and the other one is heavier. :D
Heavier than air vehicles, such as jet airplanes, are heavy and cannot easily float without propulsion. Lighter than air vehicles, such as a glider, are light enough to glide without propulsion Lighter-than-Air vehcicles means that the vehicle gets its Lift from its bouyancy. Regular aircraft get their lift from the wings due to its forward motion through the air. Gliders do not have propulsion but their wings are very long and produce enough lift to keep them flying.
Heavier: Airplanes Gliders Helicopters Lighter: Blimps Balloons
bob saget
Duck feathers are heavier and less expensive. Down feathers are lighter, warmer, and more expensive.
Webers Law
hot air balloon, jets, airplanes, etc.
Lighter
galena - cubical supposedly heavier than graphite graphite - looks like pencil lead supposedly lighter than galena
heavier because they are two different weights
lighter
"Lighter than air" aircraft are lighter than air! The most common are blimps. They do not rely on wings to generate lift. They contain a lighter than air gas (ex:helium) that lifts the craft into the air when ties to the ground are released. "Heavier than air" aircraft are the opposite. They rely on wings to generate lift to get into the air. Common heavier than air aircraft are general airplanes you see in the sky everyday.