Pupil Handmade: Self Made Toy Barometer

Handmade homemade

1. fine glass tube or pparent plastic tube, a length of about 20 cm;

2. small bottle one, cork one (diameter depends on the bottle mouth).

3. students use a ruler, a little rubber band, a little oil or oil, a bottle of glue.

Tools:

Cone and sandpaper 0.

Method:

1. use a cone to make a small hole on the cork. The aperture is slightly smaller than the outer diameter of the glass tube, and the sand paper is rolled into a small stick to grind the inner wall of the hole.

2. as shown, insert glass tube into cork and seal with glue.

Press cork tightly into the mouth of the bottle.

Usage:

observation

Measure the magnitude of atmospheric pressure (at the same time predict the weather).

Principle:

When installed, the pressure inside the bottle is equal to the external pressure (the mass of the oil drops), and the oil droplets are stationary at a certain point.

When the external pressure increases, the drop of oil drops, which indicates that the air pressure increases (indicating a clear day). Conversely, when the external pressure changes, the oil droplets rise, indicating that the pressure is decreasing (it may be rainy).