Measurement method of air temperature and humidity:? Prepare a wet ball (which can be made of a piece of cotton soaked in water), insert a thermometer into the wet ball and hang a thermometer nearby. Record two temperatures and check the hygrometer (what is a hygrometer? You can check the temperature and humidity of the air. In fact, this is the principle of measuring air humidity. ? You can check the relevant teaching materials of air conditioning principle.

As for the measurement of wind direction and speed: Have you ever seen a similar wind vane in the western United States or rural China? ? It's actually the windmill principle. Regarding wind power, I think there are two methods, one is to measure the rotational speed of the windmill, the other is to measure the thrust or torque generated when the windmill rotates. I thought of a spring scale to measure the wind. Hook the axis of the windmill with a spring scale, and the windmill can move freely along the axis, so the thrust generated by the windmill can be measured with a spring scale. ? But you have to make a big windmill to generate enough thrust, as shown in the figure; There's another way. Do you know the principle of single propeller helicopter? In order to maintain balance, a single propeller helicopter must be installed at the tail to eliminate torque. We can measure the torque of the windmill through the lever principle. ? See the picture. Wind power can be calculated by measuring the torque of the windmill. This method is a little more complicated.

Of course, these are all on paper, so it should be interesting to do it yourself.