Home made air pump

This is perhaps the simplest and most efficient Air Pump in the world.

With this pump you can inflate a balloon with air.

To make it you need a 1-litre empty plastic bottle, two balloons – one big one small, scissors and tape.

First make two holes midway on the surface of the plastic bottle.

The two holes are marked with red.

Next make a small 5-mm diameter hole in the lid with the pointed end of the scissors.

Stretch out a small balloon on the flat surface of the lid.

Tape the ends of the balloon on the rim of the lid.

Nip off the extra ends of the balloon.

The stretched balloon acts like a VALVE.

On being pushed from below the stretched balloon lifts and allows air to pass – ONLY FROM BELOW.

No, air can pass the other way.

The lid and balloon make a screechy whistle.

On blowing through the lid air escapes and makes a very screechy noise.

Air can only pass ONE WAY through this valve.

Screw on the bottle lid with the stretched balloon valve on the bottle mouth.