I know that a gas is made of atoms or molecules moving freely in space.

When these particles hit the walls of where they're kept in they cause something called pressure.

But these particles never pile up on each other and push a surface down by their weight so that we can measure it as weight not pressure.

So why gases have weight?

I know that a gas is made of atoms or molecules moving freely in space.

When these particles hit the walls of where they're kept in they cause something called pressure.

But these particles never pile up on each other and push a surface down by their weight so that we can measure it as weight, not pressure.

So why do gases have weight?

I know that a gas is made of atoms or molecules moving freely in space.

When these particles hit the walls of where they're kept in they cause something called pressure.

But these particles never pile up on each other and push a surface down by their mass so that we can measure it as mass not pressure.

So why gases have mass?

I know that a gas is made of atoms or molecules moving freely in space.

When these particles hit the walls of where they're kept in they cause something called pressure.

But these particles never pile up on each other and push a surface down by their weight so that we can measure it as weight not pressure.

So why gases have weight?