1. Many of the appliances we use in our daily life operate on the principle of air pressure.   2. Syringe     (a) A syringe is a simple device used to suck up liquids.     (b) The working principle:  ...

  1. The Earth is surrounded by a thick layer of air called atmosphere.   2. The air in the atmosphere presses on the surfaces of all objects. This is known as     air pressure.   3. There are many other ways to...