18:- Rainfall counting meter
Aim :- to make Rainfall measuring instrument.
Requirement :- 1litre bottle , funnel 100 mm.
Procedure :- take a bottle and place it on the area which is been decided
Place a funnel at the top of the bottle .as it starts to rain the water in the funnel get collected in the bottle . In collected water in bottle is took measuring cylinder. Took the
Surface area of the funnel . If the 100ml water collected in funnel.
Ex-10 cm of funnel will give you the surface area .
Formula = funnel surface area =10
3.14 × 5 mm × 6 mm = 3.14 × 25 mm sq.
1.42 m sq .