molar volume: meaning, definition, pronunciation and examples
Very Low (Specialist)Technical/Scientific
Quick answer
What does “molar volume” mean?
The volume occupied by one mole of a substance (usually a gas) under specified conditions of temperature and pressure.
Audio
Pronunciation
Definition
Meaning and Definition
The volume occupied by one mole of a substance (usually a gas) under specified conditions of temperature and pressure.
A fundamental thermodynamic property used to characterize substances, particularly useful in gas laws and equations of state, to relate microscopic particle amounts to macroscopic measurable volumes.
Dialectal Variation
British vs American Usage
Differences
No difference in meaning. Spelling of related terms may differ (e.g., 'litre' vs. 'liter' when quoting the standard value).
Connotations
None beyond the scientific context.
Frequency
Identical, very low frequency outside specific STEM fields.
Grammar
How to Use “molar volume” in a Sentence
The molar volume of [SUBSTANCE] is [VALUE].To find [PROPERTY], use the molar volume.Calculate/Determine the molar volume.Vocabulary
Collocations
Examples
Examples of “molar volume” in a Sentence
adjective
British English
- The molar volume calculation is straightforward.
- We need the molar volume data from the appendix.
American English
- The molar volume calculation is straightforward.
- We need the molar volume data from the appendix.
Usage
Meaning in Context
Business
Not used.
Academic
Core concept in university-level chemistry and physics courses, especially in physical chemistry and thermodynamics.
Everyday
Virtually never used.
Technical
Essential term in scientific research, engineering (chemical, materials), laboratory reports, and technical manuals involving gas properties or material characterization.
Vocabulary
Synonyms of “molar volume”
Neutral
Weak
Vocabulary
Antonyms of “molar volume”
Watch out
Common Mistakes When Using “molar volume”
- Using it for solids/liquids without specifying non-standard conditions.
- Confusing it with molar mass or density.
- Forgetting to specify the temperature and pressure conditions.
- Misspelling as 'molar volume' (correct) vs. 'molar volume' (incorrect).
FAQ
Frequently Asked Questions
No, it varies by substance and is highly dependent on state (solid, liquid, gas) and conditions (temperature, pressure). For ideal gases under the same conditions, the molar volume is identical.
At Standard Temperature and Pressure (STP: 0°C and 1 atm), it is approximately 22.4 litres per mole (22.4 L/mol). At Standard Ambient Temperature and Pressure (SATP: 25°C and 1 bar), it is about 24.8 L/mol.
Yes, but it is less commonly discussed than for gases because it is not a universal constant. It is a specific property of that solid or liquid under given conditions.
Molar volume (Vm) is the reciprocal of molar density. It is related to density (ρ) and molar mass (M) by the formula: Vm = M / ρ.
The volume occupied by one mole of a substance (usually a gas) under specified conditions of temperature and pressure.
Molar volume is usually technical/scientific in register.
Molar volume: in British English it is pronounced /ˈməʊlə ˈvɒljuːm/, and in American English it is pronounced /ˈmoʊlɚ ˈvɑːljəm/. Tap the audio buttons above to hear it.
Learning
Memory Aids
Mnemonic
Think: MOLAR volume = VOLume for one MOLE. Like molar mass is mass for one mole.
Conceptual Metaphor
A CONTAINER SIZE FOR A STANDARD AMOUNT (The mole is a 'standard bag' of particles; molar volume is the 'size of the box' needed to hold that bag).
Practice
Quiz
What does 'molar volume' specifically describe?