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Lei dos gases ideais

Na Galipedia, a Wikipedia en galego.

A lei dos gases ideais é unha ecuación de estado do gas ideal, un gas hipotético formado por partículas puntuais, sen atracción nin repulsión entre elas e con choques perfectamente elásticos, sen intercambio de enerxía. Un gas aproxímase ao modelo de gas ideal en condicións de temperatura elevada e presión baixa.

A lei xeral dos gases ideais obtense a partir da combinación da lei de Boyle-Mariotte, a lei de Gay-Lussac e doutras que as complementan e describe a relación entre a presión, temperatura, volume e cantidade de gas.

Ecuación de estado

Valores de R

A ecuación matemática que define esta lei é:

Na cal:

  • P é a presión do gas
  • V é o volume que ocupa o gas
  • n é o número de moles de gas
  • T é a temperatura termodinámica ou temperatura absoluta
  • R é a constante dos gases. Segundo as unidades que se utilicen, el valor da constante varía, así e todo as máis habituais son as dúas seguintes:
    • = 8,314 J·K−1·mol−1
    • = 0,082 atm·L·K−1·mol−1
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Lei dos gases ideais
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