A gas with initial state variables p1, V1, and T1 expands isothermally until V2 = 2V1. What are p2?

Ch 18: A Macroscopic Description of Matter

Knight Calc - Physics for Scientists and Engineers 5th Edition

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Knight Calc 5th Edition

Ch 18: A Macroscopic Description of Matter

문제 28b

18장, 문제 28b

A gas with initial state variables p₁, V₁, and T₁ expands isothermally until V₂= 2V₁. What are p₂?

검증된 단계별 안내

Step 1: Recognize that the process is isothermal, meaning the temperature (T) remains constant throughout the expansion. For an ideal gas undergoing an isothermal process, the relationship between pressure (p) and volume (V) is given by Boyle's Law:

p V_{1} = p_{2} V_{2}

Step 2: Substitute the given relationship for the final volume,

V_{2} = 2 V_{1}

, into Boyle's Law. This gives:

p V_{1} = p_{2} (2 V_{1})

Step 3: Simplify the equation to solve for

p_{2}

. Divide both sides of the equation by

2 V_{1}

, resulting in:

p_{2} = \frac{p_{1}}{2}

Step 4: Interpret the result. The final pressure

p_{2}

is half of the initial pressure

p_{1}

, as the volume doubles during the isothermal expansion.

Step 5: Conclude that the temperature remains constant, and the relationship between pressure and volume is inversely proportional for an isothermal process. This is a direct application of Boyle's Law.

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주요 개념

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Isothermal Process

An isothermal process is a thermodynamic process in which the temperature remains constant. For an ideal gas, this means that any heat added to the system is used to do work, rather than increasing the internal energy. In this scenario, the relationship between pressure, volume, and temperature is governed by Boyle's Law, which states that pressure and volume are inversely related when temperature is constant.

Ideal Gas Law

The Ideal Gas Law is a fundamental equation in thermodynamics that relates the pressure (p), volume (V), and temperature (T) of an ideal gas. It is expressed as PV = nRT, where n is the number of moles and R is the ideal gas constant. This law allows us to derive relationships between the state variables of a gas, particularly useful in determining the final pressure after an isothermal expansion.

Boyle's Law

Boyle's Law states that for a given mass of gas at constant temperature, the pressure of the gas is inversely proportional to its volume. Mathematically, this is expressed as P₁V₁ = P₂V₂. In the context of the question, as the gas expands isothermally to double its volume, Boyle's Law can be used to calculate the new pressure, p₂, based on the initial conditions.