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1. The atmospheric pressure is generally 100 KPa in absolute terms; why doesn’t such a high pressure crush people? 2. How to choose a suitable pressure gauge?
No one answered, so I’ll do it myself. 1. There are many spaces in the human body, and these spaces are connected to the atmosphere. The pressures acting on the inside and outside of the human body are equal in magnitude but opposite in direction; this means that the gauge pressure on the surface of the body is zero, so the body is not compressed. 2. Determine the instrument range based on the magnitude and nature of the pressure to be measured ； Determine the instrument accuracy based on the maximum allowable error for production ； The type and model of the instruments are determined based on factors such as process requirements, the properties of the medium, and the site environment.
1. Because there is also a force of one atmosphere inside the human body, which balances the external pressure. 2. The physicochemical properties of the medium, the requirements of the process such as range and accuracy, as well as environmental factors should be taken into consideration