vapour density
Definition
- Noun:
- The density of a gas relative to the density of hydrogen: A scientific measure expressing how dense a vapor or gas is compared to hydrogen gas under the same conditions of temperature and pressure.
Usage
- Vapour density is a dimensionless quantity used primarily in chemistry and physics.
- It is calculated by dividing the molar mass of the gas by the molar mass of hydrogen (approximately 2 g/mol, since hydrogen gas is H₂).
- A vapour density greater than 1 indicates the gas is denser than hydrogen.
Examples
Advanced Usage
- Historical Context: Vapour density was a crucial concept in early gas studies and determining molecular formulas before modern spectrometry.
- "Relative vapour density": Sometimes used synonymously with "vapour density" to emphasize its comparative nature.
- The relative vapour density is essential for calculating gas diffusion rates.
Variants and Related Words
- Vapor density: The American English spelling of "vapour density".
- Relative density: A broader term for the ratio of the density of a substance to the density of a reference material.
- Specific gravity: A closely related concept, typically for liquids and solids relative to water.
Synonyms
- Relative vapour density
- Gas density (relative to hydrogen)
Notes
- Vapour density is an archaic term in modern scientific contexts, largely replaced by molar mass or relative molecular mass. However, it remains in use for specific calculations and historical references.
- It is important to note that vapour density is defined relative to hydrogen gas (H₂), not atomic hydrogen.
Noun
-
the density of a gas relative to the density of hydrogen
Khám phá thêm
Các từ liên quan
Từ đồng nghĩa
Từ gần giống
