s.t.p.
Definition
Noun: - Standard temperature and pressure: A standardized set of conditions used in scientific experiments and calculations, particularly in chemistry and physics, to allow for consistent comparison of data. The standard values are typically defined as a temperature of 0°C (273.15 K) and a pressure of 1 atmosphere (101.325 kPa).
Usage
- s.t.p. is used as a noun phrase to specify the reference conditions for measuring gas volumes or properties.
- It is often written in lowercase with periods: s.t.p.. The abbreviation STP (without periods) is also very common.
- It is typically used in scientific writing, textbooks, and laboratory reports.
Examples
Advanced Usage
- "at s.t.p.": This is the most common usage, indicating that a measurement or property is defined under standard conditions.
- The molar volume is defined at s.t.p..
- "under s.t.p. conditions": A more explicit phrasing with the same meaning.
- The reaction yield was measured under s.t.p. conditions.
Variants and Related Words
- STP: A common variant of the abbreviation, often written without periods.
- Standard conditions: A more general phrase that can refer to s.t.p. or other standardized sets of conditions (e.g., in different scientific fields).
- NTP (Normal Temperature and Pressure): A related but different set of standard conditions, often defined as 20°C and 1 atmosphere.
Synonyms
- Standard conditions for temperature and pressure: The full, formal term.
- Standard state: A related but broader term in thermodynamics that may specify conditions beyond just temperature and pressure (e.g., concentration).
Notes
- s.t.p. is a specific scientific term. It is not used in everyday conversation.
- The exact numerical values for standard temperature and pressure can vary slightly between different organizations and fields (e.g., IUPAC defines it as 0°C and 100 kPa). The context usually clarifies which standard is being used.
Noun
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standard temperature and pressure
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