That is, mercury column, pressure, one of the units of pressure value, but not the international system of units. The commonly used units are centimeter mercury column (cmHg) and millimeter mercury column (mmHg).
- Chinese name
- mercury
- Foreign name
- Mercury
- Alias
- Mercury column
- Physical unit
- Pressure, pressure value
- Abbreviations
- Hg
- Classification
- CmHg and mmHg
Company Introduction
Mercury, or mercury column.
Directly expressed in millimeters of mercury column height pressure 、 pressure The unit of the value. But not International System of Units The common units are centimeter mercury (cmHg) and millimeter mercury (mmHg). For atmospheric pressure measurement, the unit is also used for high vacuum engineering (especially in pressure Low to the environment where viscosity disappears), blood pressure measurement, intraocular pressure measurement, etc. Atmospheric pressure Relation with mercury column: On the ground Standard atmospheric pressure About 760 mm high mercury column pressure 。 The measured values are different due to the influence of the measurement area and other conditions. according to Liquid pressure The formula p=ρ gh, the density of mercury is 13.6 × 10 ^ 3 kg/m3, so the mercury column 76 cm high produces Standard atmospheric pressure Strong is: P=13.6 × 10 ^ 3 kg/m3 × 9.8 N/kg × 0.76 m
≈ 1.013 × 10 ^ 5 N/m2
