Pulmonary embolism

src: i.imgur.com Pulmonary embolism ( PE ) is a blockage of an artery in the lungs by a substance that has traveled from elsewhere in the b...

Vacuum cleaner

src: brain-images-ssl.cdn.dixons.com A vacuum cleaner , also known as a sweeper or hoover , is a device that uses an air pump (a centrifuga...

Reverse osmosis

src: www.kandrwaterservice.com Reverse osmosis ( RO ) is a water purification technology that uses a semipermeable membrane to remove ions,...