How did the first steam engine work?
They were powered by air pressure pushing a piston into the partial vacuum generated by condensing steam, instead of the pressure of expanding steam. The engine cylinders had to be large because the only usable force acting on them was atmospheric pressure. Art is generally understood as any activity or product done by people with a communicative or aesthetic purpose—something that expresses an idea, an emotion or, more generally, a world view. It is a component of culture, reflecting economic and social substrates in its design.