Edexcel A-Level Combined Science 158: The Ideal Gas Equation and Kinetic Theory | 爱德思A-Level综合科学158：理想气体状态方程与分子动理论

📚 Edexcel A-Level Combined Science 158: The Ideal Gas Equation and Kinetic Theory | 爱德思A-Level综合科学158：理想气体状态方程与分子动理论

The behaviour of gases is central to A-Level Combined Science. Topic 158 examines how pressure, volume, temperature and amount of gas are connected through the ideal gas equation and how kinetic theory explains those relationships at the molecular level. This guide covers the key concepts, equations, graphs and exam strategies required for Edexcel A-Level Combined Science.

气体的行为是A-Level综合科学的核心内容。主题158考察压强、体积、温度和气体物质的量如何通过理想气体状态方程相互联系，以及分子动理论如何在分子层面解释这些关系。本指南涵盖爱德思A-Level综合科学所需的重点概念、方程、图像和考试策略。

1. The Ideal Gas Equation: pV = nRT | 理想气体状态方程：pV = nRT

The ideal gas equation is pV = nRT, where p is pressure in pascals (Pa), V is volume in cubic metres (m³), n is the amount of gas in moles (mol), T is absolute temperature in kelvin (K) and R is the molar gas constant, 8.31 J K⁻¹ mol⁻¹. An ideal gas is a theoretical model in which particles have no volume and no intermolecular forces.

理想气体状态方程为 pV = nRT，其中 p 为压强（单位 Pa），V 为体积（单位 m³），n 为气体物质的量（单位 mol），T 为热力学温度（单位 K），R 为摩尔气体常数 8.31 J K⁻¹ mol⁻¹。理想气体是一种理论模型，该模型中气体粒子本身没有体积，粒子间也没有分子间作用力。

The equation can be rearranged to find any variable: n = pV / RT, T = pV / nR, p = nRT / V and V = nRT / p. Always convert temperature from °C to K by adding

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