The aneroid barometer has a small empty box made of two thin elastic plates – membranes. Since there is a void inside this box, the pressure inside it is zero. Atmospheric air pressure compresses the box, but this compression is prevented by a steel spring, which pulls one plate – the membrane from the other and balances the effect of atmospheric pressure. A pointer arrow is connected to the membrane through a transmission mechanism, which can move relative to the scale.
Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.