Humidity measurement. Drawing, description

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Humidity measurement. Children's Science Lab

Children's Science Lab

We will tell you how to make fairly accurate psychrometers that measure air humidity. But first, let's remember that the principle of operation of such a device is based on the ability of some materials to elongate by absorbing moisture from the atmospheric air.

The simplest psychrometer can be made from a strip of ordinary photographic paper, one end of which is rigidly fixed to the body, and on the other, on an axis with an arrow attached.

As humidity changes, the photo paper curls and the arrow turns accordingly. In addition to photographic paper, a strip of cellophane, fat-free hair, a dry vein, and even a V-shaped knot from a tree will serve as a sensor. The branches on the inside should be cut off half, and the outer side should be covered with nitro-paint and the resulting blank should be provided with an arrow and a scale.

The device of each psychrometer is easy to understand from the figures. So there will be no difficulties in this regard. The only problem is getting the scale right. To do this, it is best to use the readings of the control device, which is probably in every school physics room.

Humidity measurement
Paper psychrometer: 1 - metal case; 2 - a strip of photographic paper with an emulsion outward; 3 - pin axis; 4 - cork; 5 - arrow

Humidity measurement
Hair psychrometer: 1 - rack; 2 - dry vein or fat-free hair; 3 - stand

Humidity measurement
Tape psychrometer: 1 - rack; 2 - cellophane; 3 - stand

Humidity measurement
Psychrometer from a knot: general view: 1 - arrow from a two-millimeter wire; 2 - stretch marks; 3 - spiral; 4 - scale

Humidity measurement
Enlarged spiral

Author: A.Sominich

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