毫米汞柱（英語： Millimeter of mercury ），符號為mmHg，是一種压强單位，舊定義：一毫米高的水銀柱對液柱底面產生的压强，現在定義：一毫米汞柱為133.322387415帕斯卡，約為1托 [1] 。

The molar gas constant (also known as the gas constant, universal gas constant, or ideal gas constant) is denoted by the symbol R or R. It is the molar equivalent to the Boltzmann constant , expressed in units of energy per temperature increment per amount of substance , rather than energy per temperature increment per particle .

Jul 16, 2024 · The gas constant or R is an essential constant in the ideal gas law. Discover the definition and value of the gas constant.

Feb 11, 2021 · The gas constant (R) is a proportionality constant used in the ideal gas law and Nernst equation. It’s also called the ideal gas constant, universal gas constant, or molar gas constant. Basically, the gas constant is the same as the Boltzmann constant (k), except the gas constant includes Avogadro’s number (N A): R = NA k

Definition of the universal gas constant (R) frequently used in ideal gas equations, along with gas constant values for different units.

The induvidual gas constant, R, for a gas can be calculated from the universal gas constant, R u ( given in several units below), and the gas molecular weight, M gas : R = R u / M gas (1)

在线毫米汞柱和千帕换算器，可快速将毫米汞柱换算成千帕，也可将千帕转换成毫米汞柱或其他压力单位之间相互换算。

在线毫米汞柱和毫巴换算器，可快速将毫米汞柱换算成毫巴，也可将毫巴转换成毫米汞柱或其他压力单位之间相互换算。

汞 (Hg)的密度ρ=13.59g/cm^3，重力常数g=9.8N/kg，那么1mmHg的压强为，P=13.59g/cm^3x9.8N/kgx1mm=13.59x10.

在线毫米汞柱和兆帕换算器，可快速将毫米汞柱换算成兆帕，也可将兆帕转换成毫米汞柱或其他压力单位之间相互换算。