# Determine what will happen to the temperature of a confined gas as the pressure increases

An animation showing the relationship between pressure and volume when mass and temperature are held constant

Boyle's law, also referred to as the Boyle–Mariotte law, or Mariotte's law (especially in France), is an experimental gas law that describes the relationship between pressure and volume of a confined gas. Boyle's law has been stated as:

The absolute pressure exerted by a given mass of an ideal gas is inversely proportional to the volume it occupies if the temperature and amount of gas remain unchanged within a closed system.[1][2]

Mathematically, Boyle's law can be stated as:

P∝1V{\displaystyle P\propto {\frac {1}{V}}}Pressure is inversely proportional to the volume

or

PV = kPressure multiplied by volume equals some constant k

where P is the pressure of the gas, V is the volume of the gas, and k is a constant.

Boyle's Law states that when the temperature of a given mass of confined gas is constant, the product of its pressure and volume is also constant. When comparing the same substance under two different sets of conditions, the law can be expressed as:

P1V1=P2V2.{\displaystyle P_{1}V_{1}=P_{2}V_{2}.}

showing that as volume increases, the pressure of a gas decreases proportionally, and vice versa. Boyle's Law is named after Robert Boyle, who published the original law in 1662.[3]

## History

The relationship between pressure and volume was first noted by Richard Towneley and Henry Power in the 17th century.[4][5] Robert Boyle confirmed their discovery through experiments and published the results.[6] According to Robert Gunther and other authorities, it was Boyle's assistant, Robert Hooke, who built the experimental apparatus. Boyle's law is based on experiments with air, which he considered to be a fluid of particles at rest in between small invisible springs. Boyle may have begun experimenting with gases due to an interest in air as an essential element of life;[7] for example, he published works on the growth of plants without air.[8] Boyle used a closed J-shaped tube and after pouring mercury from one side he forced the air on the other side to contract under the pressure of mercury. After repeating the experiment several times and using different amounts of mercury he found that under controlled conditions, the pressure of a gas is inversely proportional to the volume occupied by it.[9]

The French physicist Edme Mariotte (1620–1684) discovered the same law independently of Boyle in 1679,[10] after Boyle had published it in 1662.[9] Mariotte did, however, discover that air volume changes with temperature.[11] Thus this law is sometimes referred to as Mariotte's law or the Boyle–Mariotte law. Later, in 1687 in the Philosophiæ Naturalis Principia Mathematica, Newton showed mathematically that in an elastic fluid consisting of particles at rest, between which are repulsive forces inversely proportional to their distance, the density would be directly proportional to the pressure,[12] but this mathematical treatise is not the physical explanation for the observed relationship. Instead of a static theory, a kinetic theory is needed, which was provided two centuries later by Maxwell and Boltzmann.

This law was the first physical law to be expressed in the form of an equation describing the dependence of two variable quantities.[9]

## Definition

Boyle's law demonstrations

The law itself can be stated as follows:

For a fixed mass of an ideal gas kept at a fixed temperature, pressure and volume are inversely proportional.[2]

Or Boyle's law is a gas law, stating that the pressure and volume of a gas have an inverse relationship. If volume increases, then pressure decreases and vice versa, when the temperature is held constant.

Therefore, when the volume is halved, the pressure is doubled; and if the volume is doubled, the pressure is halved.

### Relation with kinetic theory and ideal gases

Boyle's law states that at constant temperature the volume of a given mass of a dry gas is inversely proportional to its pressure.

Most gases behave like ideal gases at moderate pressures and temperatures. The technology of the 17th century could not produce very high pressures or very low temperatures. Hence, the law was not likely to have deviations at the time of publication. As improvements in technology permitted higher pressures and lower temperatures, deviations from the ideal gas behavior became noticeable, and the relationship between pressure and volume can only be accurately described employing real gas theory.[13] The deviation is expressed as the compressibility factor.

Boyle (and Mariotte) derived the law solely by experiment. The law can also be derived theoretically based on the presumed existence of atoms and molecules and assumptions about motion and perfectly elastic collisions (see kinetic theory of gases). These assumptions were met with enormous resistance in the positivist scientific community at the time, however, as they were seen as purely theoretical constructs for which there was not the slightest observational evidence.

Daniel Bernoulli (in 1737–1738) derived Boyle's law by applying Newton's laws of motion at the molecular level. It remained ignored until around 1845, when John Waterston published a paper building the main precepts of kinetic theory; this was rejected by the Royal Society of England. Later works of James Prescott Joule, Rudolf Clausius and in particular Ludwig Boltzmann firmly established the kinetic theory of gases and brought attention to both the theories of Bernoulli and Waterston.[14]

The debate between proponents of energetics and atomism led Boltzmann to write a book in 1898, which endured criticism until his suicide in 1906.[14] Albert Einstein in 1905 showed how kinetic theory applies to the Brownian motion of a fluid-suspended particle, which was confirmed in 1908 by Jean Perrin.[14]

### Equation

The mathematical equation for Boyle's law is:

PV=k{\displaystyle PV=k}

where P denotes the pressure of the system, V denotes the volume of the gas, k is a constant value representative of the temperature and volume of the system.

So long as temperature remains constant the same amount of energy given to the system persists throughout its operation and therefore, theoretically, the value of k will remain constant. However, due to the derivation of pressure as perpendicular applied force and the probabilistic likelihood of collisions with other particles through collision theory, the application of force to a surface may not be infinitely constant for such values of V, but will have a limit when differentiating such values over a given time. Forcing the volume V of the fixed quantity of gas to increase, keeping the gas at the initially measured temperature, the pressure P must decrease proportionally. Conversely, reducing the volume of the gas increases the pressure. Boyle's law is used to predict the result of introducing a change, in volume and pressure only, to the initial state of a fixed quantity of gas.

The initial and final volumes and pressures of the fixed amount of gas, where the initial and final temperatures are the same (heating or cooling will be required to meet this condition), are related by the equation:

P1V1=P2V2.{\displaystyle P_{1}V_{1}=P_{2}V_{2}.}

Here P1 and V1 represent the original pressure and volume, respectively, and P2 and V2 represent the second pressure and volume.

Boyle's law, Charles's law, and Gay-Lussac's law form the combined gas law. The three gas laws in combination with Avogadro's law can be generalized by the ideal gas law.

## Human breathing system

Boyle's law is often used as part of an explanation on how the breathing system works in the human body. This commonly involves explaining how the lung volume may be increased or decreased and thereby cause a relatively lower or higher air pressure within them (in keeping with Boyle's law). This forms a pressure difference between the air inside the lungs and the environmental air pressure, which in turn precipitates either inhalation or exhalation as air moves from high to low pressure.[15]

### What will happen to the temperature of a confined gas as the pressure increases?

(5) If the pressure of a confined gas is tripled while its temperature remains constant, the average thermal energy of the molecules will increase by a factor 3. The correct answer is option 2. 1. The pressure of a confined gas is directly proportional to the absolute temperature.

### What do you think will happen to the temperature of a confined gas as the pressure decreases?

Decreasing Pressure Therefore, if you decrease the pressure of a fixed amount of gas, its volume will increase. However, if you were to maintain a constant volume while decreasing pressure, the temperature would also have to decrease. The relationship of gases at a constant volume is given by Gay-Lussac's law.

### What would happen to the temperature if the pressure of a gas is increased in the volume is constant?

What effect does increasing pressure have on gas particles? when the pressure of a gas at constant temperature is increased, the volume of the gas decreases. when the pressure is decreased, the volume increases.

### What happens to the temperature of a gas as its volume increases at constant pressure according to Charles Law?

According to Charles's law, if the pressure of a gas is held constant, increasing the temperature of the gas increases its volume. What happens when a gas is heated? Its particles gain energy. With more energy, the particles have a greater speed.