How do airships fly?

Answer 1

Just like how a ship floats in the sea because it weighs less than the amount of water it displaces... an airship weighs less than the amount of air it displaces.

This is accomplished through the use of lighter-than-air gasses such as helium. In the past hydrogen was used for this, but due to its high flammability this is no longer done. Helium is completely non-flammable and thus is perfectly safe lifting agent.

The pilot adjusts the airships bouyancy by either adding more gas, venting gas or by dropping ballast (usually water tanks or sandbags) Once the airship has neutral bouyancy, it can be steered using the elevators and rudders.
It is similar in principle to a submarine, which uses 'air' in the ballast to float to the surface and water to descend. Airships rise when 'air' in their hull tanks is replaced with a 'lighter than air' gas, such as Hydrogen or Helium.
Just like how a ship floats in the sea because it weighs less than the amount of water it displaces... an airship weighs less than the amount of air it displaces.

This is accomplished through the use of lighter-than-air gasses such as helium. In the past hydrogen was used for this, but due to its high flammability this is no longer done. Helium is completely non-flammable and thus is perfectly safe lifting agent.

The pilot adjusts the airships bouyancy by either adding more gas, venting gas or by dropping ballast (usually water tanks or sandbags) Once the airship has neutral bouyancy, it can be steered using the elevators and rudders.
It is similar in principle to a submarine, which uses 'air' in the ballast to float to the surface and water to descend. Airships rise when 'air' in their hull tanks is replaced with a 'lighter than air' gas, such as Hydrogen or Helium.

Answer 2

Airships fly by utilizing the principle of buoyancy: the gas inside the airship is lighter than the surrounding air, causing it to float upwards. They are also equipped with engines and rudders to control direction and altitude. By adjusting the amount of gas and ballast on board, airships can maneuver through the sky.