CoHaCeMo

1) hydraulic: the science of pressure in fluids 2)pnumatic:the use of compressed air in a confined space 3) dentists chair,brakes of a transport, tractor,backhoe 4)air compressor,air drill,airgun,airsoft gun 5)hydraulic systems work by using pressure in oil or other fluids 6)pneumatic systems work by using air in a confined space 7)pneumatic systems work with air and hydraulic systems work with oil

hydraulic video []

pnumatic video [|http://www.youtube.com/watch?v=UuK3ESGgbqk&feature=player_detailpage#t=83s]