Inch of mercury (inHg and ″Hg) is a non-SI unit of measurement for pressure. It is used for barometric pressure in weather reports, refrigeration and aviation in the United States. It is the pressure exerted by a column of mercury 1 inch (25.4 mm) in …

It is defined as the pressure exerted by a column of mercury of 1 inch in height at 32 °F (0 °C) at the standard acceleration of gravity. 1 inHg = 3,386.389 pascals at 0 °C.

Inches of mercury or inHg is a non-SI unit for pressure. It is still widely used for barometric pressure in weather reports and aviation in the United States, but is considered somewhat outdated elsewhere.

It is defined as the pressure exerted by a column of mercury of 1 inch in height at 32 °F (0 °C) at the standard acceleration of gravity. 1 inHg = 3,386.389 pascals at 0 °C.

1 inch Hg = 3,386 Pa=3.386kpa。 处于真空状态下的气体稀薄程度，通常用真空度表示。 真空度数值是表示出系统压强实际数值低于大气压强的数值，即： 真空度=(大气压强—绝对压强）若所测设备内的压强低于大气压强，其压力测量需要真空表。

ver 08-Aug-2017 % Vacuum. ATM (standard atmosphere) PSIG negative gauge. Torr (mm Hg) negative gauge. inches Hg negative gauge. kPa negative gauge. bar negative gauge

Seamlessly convert between key pressure units, such as Inches of Mercury (inHg), Millimeters of Mercury (mmHg), Pascal (Pa), HectoPascal (hPa) or Millibar (mb), Bar (bar), Atmosphere (atm), and Pound per Square Inch (psi).

Inch of Mercury is a British and American unit of measure for pressure. 1 inch of mercury at 0 degrees Celsius (32 deg F) equals 3386.39 pascals. An inch of mercury at zero degrees Celsius is defined as the pressure exerted by a column of mercury with a density of 13,595.1 kg/m3 under the pull of gravity at 9.80665 m/s2.

Inches of mercury (inHg) conversion calculators, tables and definition, converts Inches of mercury to other pressure units.

Choose a value between 0 and 40 inHg 0°C from the pressure conversion table below, to obtain the converted value in psi. Scroll down to a pressure from 0.01 to 40.00 inches of mercury column to see the matching reading in psi units.