Depending on which parameter we want to estimate, Boyle's law formula can be written in various ways. Let's say we change the volume of a gas under isothermal conditions, and we want to find the resulting pressure. Then, the equation of Boyle's law states that:. As we can see, the ratio of the final and initial pressure is the inverse of the ratio for volumes.
This Boyle's law calculator works in any direction you like. Just insert any three parameters, and the fourth one will be calculated immediately!
The whole process can be visualized on a Boyle's law graph. The most commonly used type is where the pressure is a function of the volume. For this process, the curve is a hyperbola.
The transition can progress in both ways, so both compression and expansion of the gas satisfy Boyle's law. Imagine that we have an elastic container that holds a gas. The question is: "How does the pressure of the gas change? We can use Boyle's law formula:. After halving the volume, the internal pressure is doubled. This is a consequence of the fact that the product of the pressure and the volume must be constant during this process.
The next Boyle's law example concerns a gas under 2. If you twist part of the balloon forcing the gas into a smaller space, the pressure in the balloon will increase. If the balloon is untwisted, the pressure decreases back to the original state. Boyle's law describes the relationship between pressure and volume.
If you want to use this formula, temperature and the number of moles must be constant. In this video, you will get a chance to practice two problems using Boyle's law.
You will also find out when to use this law instead of other gas laws. Chemistry Gas Laws. Go to Topic. Explanations 3. Caroline Monahan. It is important to remember the units for initial and final conditions are the same. Do not start with pounds and cubic inches for initial pressure and volume units and expect to find pascals and liters without converting the units first. There are two other common ways to express the formula for Boyle's law. According to this law, at a constant temperature, the product of pressure and volume is a constant:.
A 1 L volume of a gas is at a pressure of 20 atm. A valve allows the gas to flow into a 12 L container, connecting the two containers. What is the final pressure of this gas? A good place to start this problem is to write out the formula for Boyle's law and identify which variables you know and which remain to be found. Dividing both sides of the equation by V 2 gives you:. If you're still confused, you may wish to review another worked Boyle's Law problem.
Boyle's law is not the only special case of the ideal gas law. Two other common laws are Charles' law constant pressure and Gay-Lussac's law constant volume. Boundless vets and curates high-quality, openly licensed content from around the Internet. This particular resource used the following sources:. Skip to main content. Search for:.
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