Gas Laws Calculator – Calculate Boyle’s Law, Charles’s Law, and Ideal Gas Law

Gass Laws Caclulator online 1
Gass Laws Caclulator online 1

Gas Laws Calculator – Calculate Boyle’s Law, Charles’s Law, and Ideal Gas Law

Gas Laws Calculator – Calculate Boyle’s Law, Charles’s Law, and Ideal Gas Law

Gas Laws Calculator

Demystifying the Ideal Gas: A Comprehensive Guide

Unraveling the intricacies of an ideal gas, a fundamental concept in thermodynamics, is essential for understanding the behavior of gases under various conditions. In this article, we'll explore the concept of an ideal gas, delve into its properties, and decipher the ideal gas law equation. Let's embark on a journey to demystify this fascinating aspect of the physical world.

What Constitutes an Ideal Gas?

An ideal gas is a particular state of matter that adheres to a set of specific conditions:

Molecular Chaos

An ideal gas comprises an extensive number of molecules in perpetual, chaotic motion. These molecules move randomly within the confines of their container.

Point Particle Nature

In the realm of ideal gases, molecules are considered point particles. In other words, they are assumed to have negligible volume, occupying no space within the container.

Minimal Interaction

Molecules in an ideal gas interact only through collisions. There are no attractive or repulsive forces between them, simplifying the analysis of their behavior.

Elastic Collisions

Collisions between gas particles in an ideal gas are perfectly elastic. This means that kinetic energy is conserved during collisions, ensuring that no energy is lost in the process.

Newton's Laws

The behavior of ideal gases obeys Newton's laws of motion, providing a solid foundation for understanding their dynamics.

The Ideal Gas Law Equation

All the characteristics of an ideal gas are encapsulated in the ideal gas law equation, expressed as:

p · V = n · R · T


  • p represents the pressure of the gas, measured in pascals (Pa).
  • V signifies the volume of the gas, measured in cubic meters (m³).
  • n indicates the amount of substance, measured in moles.
  • R stands for the ideal gas constant.
  • T denotes the temperature of the gas, measured in kelvins (K).

To determine any of these values, you can easily calculate them by inputting the others into the ideal gas law calculator.

For instance, if you want to compute the volume of 40 moles of a gas under a pressure of 1013 hPa and at a temperature of 250 K, the result can be obtained as follows:

V = (nRT) / p = (40 × 8.31446261815324 × 250) / 101300 = 0.82 m³.

Deciphering the Ideal Gas Constant

The ideal gas constant, symbolized as R, plays a pivotal role in various fundamental equations, including the ideal gas law. Its value is precisely 8.31446261815324 J/(mol·K).

This constant can also be defined as the product of Boltzmann's constant k (which relates the kinetic energy and temperature of a gas) and Avogadro's number (the number of atoms in a mole of substance):

R = NA · k = (6.02214076 × 1023 mol-1) · (1.38064852 × 10-23 J/K) = 8.3144626 J/(mol·K)

For those seeking to understand the atmospheric pressure at different altitudes, an air pressure at altitude calculator can prove to be a valuable tool.

Frequently Asked Questions

When Can I Apply the Ideal Gas Law?

The ideal gas law is applicable to any gas when its density is low enough to prevent the emergence of strong intermolecular forces. In such conditions, the behavior of every gas can be adequately described by the simple equation PV = nRT, which correlates pressure, temperature, and volume.

What Is the Formula of the Ideal Gas Law?

The formula of the ideal gas law is expressed as:

PV = nRT


  • P represents pressure, measured in pascals (Pa).
  • V signifies volume, measured in cubic meters (m³).
  • n indicates the number of moles.
  • T denotes temperature, measured in kelvins (K).
  • R is the ideal gas constant.

It is essential to use consistent units when applying this formula. The commonly used value for R, 8.314... J/mol·K, corresponds to pressure measured exclusively in pascals.

What Is the Pressure of 0.1 Moles of a Gas at 50°C in a Cubic Meter?

The pressure of 0.1 moles of a gas at 50°C in a cubic meter is approximately 268.7 pascals (Pa), or 0.00265 atmospheres (atm). To arrive at this result, follow these steps:

  1. Convert the temperature into kelvin:

T (K) = 273.15 + 50 = 323.15 K

  1. Calculate the product of temperature, the number of moles, and the gas constant:

nRT = 0.1 mol × 323.15 K × 8.3145 J/mol·K = 268.7 J (energy)

  1. Divide by the volume (in this case, the volume is 1):

P = 268.7 Pa

What Are the Three Thermodynamics Laws Identified in the Ideal Gas Law?

The ideal gas law comprises four parameters, with one of them being the number of moles, which is somewhat beyond the scope of thermodynamics. The other three parameters are pressure, temperature, and volume. By fixing each of these parameters in turn, we can identify three thermodynamic laws:

  • Fixing the temperature leads to the isothermal transformation, known as Boyle's law: PV = k.
  • Fixing the volume results in the isochoric transformation, referred to as Charles's law: P/T = k.
  • Fixing the pressure yields the isobaric transformation, known as Gay-Lussac's law: V/T = k.

Calculating Gas Temperature Given Moles, Volume, and Pressure

To calculate the temperature of a gas when provided with pressure and volume, follow these simple steps:

  1. Calculate the product of pressure and volume, ensuring consistent units (e.g., pascals and cubic meters).
  2. Compute the product of the number of moles and the gas constant. If using pascals and cubic meters, use the constant R = 8.3145 J/mol·K.
  3. Divide the result from step 1 by the result from step 2 to obtain the temperature in kelvin:

T = (PV) / (nR)

By understanding and applying the ideal gas law, you can gain valuable insights into the behavior of gases in various situations.


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