Definition

Noun: - A law of physics: Charles's law states that the volume of an ideal gas is directly proportional to its absolute temperature when the pressure is held constant. This means if the temperature increases, the volume increases proportionally, and vice versa.

Usage

• Charles's law is a fundamental principle in thermodynamics and gas physics.
• It is typically expressed with the formula: V/T = k, where V is volume, T is absolute temperature (in Kelvin), and k is a constant.
• It is used to predict and explain the behavior of gases under heating or cooling at constant pressure.

Examples

• Noun:
  • According to Charles's law, a balloon will expand when heated because the gas inside increases in volume.
  • The experiment demonstrated Charles's law by showing the linear relationship between the temperature and volume of the trapped air.
  • Understanding Charles's law is essential for explaining why hot air rises.

Advanced Usage

• "To obey Charles's law": To behave in a manner consistent with the predictions of Charles's law.
  • Under these controlled conditions, the gas was found to obey Charles's law quite closely.
• Charles's law is often combined with Boyle's law and Gay-Lussac's law to form the combined gas law, which describes the relationship between pressure, volume, and temperature for a fixed amount of gas.

Variants and Related Words

• Law of volumes: An alternative name for Charles's law.
• Gay-Lussac's law: A closely related law stating that the pressure of a gas is directly proportional to its absolute temperature at constant volume. It is sometimes also referred to as Charles's law.
• Ideal gas law: The more general law (PV = nRT) that incorporates Charles's law, Boyle's law, and Avogadro's law.

Synonyms

• Law of Charles and Gay-Lussac: A synonym acknowledging the work of both scientists.
• Charles' law: A common variant spelling without the possessive 's'.

Related Concepts

• Absolute zero: The theoretical temperature (-273.15°C or 0 K) at which, according to Charles's law, the volume of an ideal gas would become zero.
• Thermal expansion: The general phenomenon of which Charles's law is a specific case for gases at constant pressure.

Noun

1. (physics) the density of an ideal gas at constant pressure varies inversely with the temperature