Hydraulic canon (Air & its properties)
Carry out a series of experiments to understand different properties of air:
• air occupies space & has weight – Balloon balance
• air can push things – Hydraulic canon
• air (oxygen) is needed for combustion – Water candle experiment

Rain water harvesting
Make houses with different roof tops ( slant and flat) to understand:
• Chanelling mechanisms for flat and slant roofed houses
• Collection pit

Make a water pump to understand the the complete mechanism:
• Collecting rain water (roofs) – Storing ( in a sump) – and then retrieving (using a pump).