Use this chemistry calculator to reproduce a named relationship with explicit quantities and units for study, laboratory planning, or an independent numerical check.

Gas molar mass (g/mol)

Molar mass of the gas; must be greater than zero.

Compute vapor density relative to air as the ratio of molar masses M(gas)/28.96. The tool evaluates the supplied inputs together and returns the named outputs below; it does not infer omitted operating conditions or change the units shown.^[1]

Vapor density (air)

Density relative to air; values below one are lighter than air.

• The result is conditional on the stated model, constants, standard state, temperature, pressure, composition, and unit basis. Real mixtures and measurements can depart from ideal behavior and carry uncertainty not represented by a single calculated value.
• Use finite inputs in the displayed units and preserve more precision than the final presentation requires. Independently verify safety-critical, financial, compliance, or production decisions.

Check units and significant figures, compare the result with limiting cases, and use measured or source-specific constants where available. Laboratory, safety, and regulatory decisions require validated methods and appropriate uncertainty analysis.

• Molar Mass From Vapor Density Air Calculator

  Estimate molar mass from vapor density relative to air using M = 28.96 × VD(air).

• Vapor Density Relative to H2 Calculator

  Compute vapor density relative to hydrogen as the ratio of molar masses M(gas)/M(H₂).

• Molar Mass From Vapor Density H2 Calculator

  Estimate molar mass from vapor density relative to hydrogen gas using M = 2.016 × VD(H₂).