Skip to Content

What is p1V1 T1 p2v2 T2?

If you have ever studied Chemistry or Physics, you must have come across the term gas laws. These laws describe how gases interact in different conditions, and the behavior of gases under different variables such as pressure, volume, and temperature. One of the fundamental gas laws is the Combined Gas Law, which is expressed as P1V1T1 = P2V2T2. In this blog post, we will explore in detail what this formula means and how we can use it in different gas situations.

The Concepts behind the Combined Gas Law

Before delving into the Combined Gas Law, we need first to understand the three fundamental gas laws it combines. These three laws are:

– Charles’ Law: This law states that the volume of a gas is directly proportional to its temperature, given constant pressure.

– Boyle’s Law: This law states that the pressure of a gas is inversely proportional to the volume, given constant temperature.

– Gay-Lussac’s Law: This law states that the pressure of a gas is directly proportional to its temperature, given constant volume.

The Combined Gas Law brings together all three laws to help us calculate the properties of gases under a range of conditions, and it is fundamental in understanding many scientific and industrial processes.

The Formula and Its Meaning

The Combined Gas Law equation combines pressure (P), volume (V), and temperature (T) on both sides of the equation. The equation is typically written as:

P1V1T1 = P2V2T2


– P1 is the initial pressure
– V1 is the initial volume
– T1 is the initial temperature
– P2 is the final pressure
– V2 is the final volume
– T2 is the final temperature

The equation implies that the product of pressure, volume, and temperature is constant as the gas undergoes different conditions. Therefore, if the value of any of the variables is altered, then the value of at least one of the other variables must also change to maintain pressure equilibrium.

The equation can be used in various situations, such as solving for an unknown variable in the equation, determining the new pressure or volume of a gas when the temperature changes, or predicting how a gas sample will behave under different conditions.

Applications of the Combined Gas Law

The Combined Gas Law has numerous real-life applications. Here are a few examples:

– Internal combustion engines: The Combined Gas Law plays a significant role in the operation of internal combustion engines in vehicles. The law helps to explain how air, fuel, and the spark work together to power the engine by adjusting the volume, pressure, and temperature of the exhaust gases and air mixture.

– Scuba diving: Understanding the behavior of gases is essential for scuba divers. The law helps to explain how air is compressed in scuba tanks to ensure safe and efficient breathing when diving at different depths.

– Climate control: The Combined Gas Law is fundamental in the operation of refrigeration and air conditioning systems. The law explains how refrigerants circulate inside air conditioners and fridges, absorbing heat from the surrounding air and then releasing it outside.

– Greenhouse effect: The Combined Gas Law helps to explain the greenhouse effect. The greenhouse gases trap the heat from the sun in the atmosphere by holding in the heat-radiating infrared light. As the temperature increases, the volume of gas increases, resulting in a rise in the atmospheric pressure.


In conclusion, the Combined Gas Law is one of the fundamental gas laws that bring together the three laws of Charles, Boyle, and Gay-Lussac. It describes the relationship between pressure, volume, and temperature and provides a fundamental understanding of how gases behave under different conditions. The equation has multiple applications ranging from engines and scuba diving to climate control and the greenhouse effect. Understanding the Combined Gas Law is therefore crucial for scientific and industrial applications.


What gas law is v1n1 v2n2?

The gas law that is represented by the equation v1n1 = v2n2 is known as Avogadro’s law. This law states that the total number of atoms or molecules in any gas is directly proportional to the volume that is occupied by the gas, provided that the temperature and pressure remain constant.

The law is named after the Italian scientist Amedeo Avogadro, who discovered that at a given temperature and pressure, equal volumes of gases contain the same number of particles. This is known as Avogadro’s principle. He also discovered that the molecular weight of a gas is proportional to its density at a given temperature and pressure.

Avogadro’s law has an important implication for the behavior of gases. If we have two samples of gas with equal volume, but one contains more particles than the other, then the one with more particles will have a higher pressure. This is because more particles will collide with the walls of the container, exerting a greater force per unit area.

The equation v1n1 = v2n2 can be used to calculate the volume of a gas at a given pressure and temperature, if we know the number of particles that are present. Conversely, it can also be used to calculate the number of particles in a gas if we know the volume that it occupies.

Avogadro’S law provides an important link between the volume of a gas and the number of particles that it contains. This law has many practical applications, such as in the design of industrial gas storage tanks, where the volume of gas that can be stored is directly related to the number of particles present.

What law is the following formula p1 v1 P2 V2?

The formula P1V1=P2V2 is related to Boyle’s Law, which states that when the temperature of a gas is kept constant, the pressure and volume of that gas are inversely proportional to each other. This means that as pressure increases, the volume of the gas will decrease, and as pressure decreases, the volume of the gas will increase. This relationship can be defined mathematically using the Boyle’s Law formula: P1V1=P2V2.

Boyle’s Law is important in the study of gases, as it helps explain many of the behaviors and properties of gases that we observe in everyday life. For example, when a car tire is inflated, the pressure of the air inside the tire increases, causing the volume of the air to decrease and the tire to appear firm. Conversely, when a balloon is deflated, the pressure of the air inside the balloon decreases, causing the volume of the balloon to increase and the balloon to appear squishy.

Although Boyle’s Law is often discussed in terms of ideal gases, it is important to note that real gases obey Boyle’s Law only under ideal circumstances. In reality, gases can exhibit deviations from ideal behavior due to factors such as intermolecular forces, volume exclusion, and non-constant temperature. Therefore, it is important to understand Boyle’s Law as a general principle, rather than as a strict rule that applies in all situations.

The formula P1V1=P2V2 is related to Boyle’s Law, which describes the inverse relationship between the pressure and volume of a gas when the temperature is kept constant. This law has important practical applications, but it is important to remember that it is a general principle that may not always hold true under non-ideal conditions.

What does v1 and V2 mean in chemistry?

In the field of chemistry, V1 and V2 are terms used to denote the volume at two different states of a gas. Specifically, V1 refers to the initial volume of a gas at one state, while V2 refers to the final volume of the gas at a different state. The terms are often used in mathematical equations that relate the volume, pressure, temperature, and other properties of gases.

These equations are derived from the kinetic theory of gases, which explains how gases behave at a molecular level. According to this theory, gases consist of tiny particles (molecules or atoms) that are in constant motion. The motion of these particles is affected by various factors, such as pressure, temperature, and volume.

When the pressure of a gas is increased, for example, the molecules of the gas are compressed into a smaller volume. This means that the gas has a smaller V2 than V1, assuming that the other properties of the gas remain constant. Conversely, when the pressure of the gas is decreased, the molecules have more space to move around, and the gas occupies a larger volume (V2) than its initial volume (V1).

Similarly, changes in temperature can also affect the volume of a gas. As the temperature of a gas increases, its molecules gain more kinetic energy and move around faster. This causes the gas to expand and occupy a larger volume (V2). Likewise, if the temperature of the gas is lowered, the molecules move more slowly and the gas contracts, occupying a smaller volume (V2).

The concepts of V1 and V2 are crucial for understanding the behavior of gases in different conditions. By knowing the initial and final volumes of a gas, scientists can calculate its pressure, temperature, and other properties using mathematical equations. This knowledge has numerous practical applications, such as in the design of engines, the manufacture of chemicals, and the study of atmospheric processes.