# Pressure vs volume relationship gases of the atmosphere

### Boyle's law - Wikipedia Boyle's Law means that gas: Expands as altitude increases, because there is less pressure on it from the surrounding atmosphere. ○. V1 = the initial volume. Boyle's law, sometimes referred to as the Boyle–Mariotte law, or Mariotte's law ( especially in The equation states that the product of pressure and volume is a constant for a Similarly, as volume decreases, the pressure of the gas increases. Boyle's law is based on experiments with air, which he considered to be a fluid. The gas we will use is air, and it will be confined in a syringe connected to a Gas Determine the relationship between pressure and volume of a gas and.

Boyle used non-SI units to measure the volume in. Hg rather than mmHg. Because PV is a constant, decreasing the pressure by a factor of two results in a twofold increase in volume and vice versa. The Relationship between Temperature and Volume: Charles's Law Hot air rises, which is why hot-air balloons ascend through the atmosphere and why warm air collects near the ceiling and cooler air collects at ground level.

Boyle's Law

Because of this behavior, heating registers are placed on or near the floor, and vents for air-conditioning are placed on or near the ceiling. The fundamental reason for this behavior is that gases expand when they are heated.

Because the same amount of substance now occupies a greater volume, hot air is less dense than cold air. The substance with the lower density—in this case hot air—rises through the substance with the higher density, the cooler air. A sample of gas cannot really have a volume of zero because any sample of matter must have some volume.

Note from part a in Figure 6. Similarly, as shown in part b in Figure 6. The Relationship between Volume and Temperature. The temperature scale is given in both degrees Celsius and kelvins. The shape of this profile-curve is called a negative exponential decrease compare Figures 1. The density profile behaves in a similar way. The pressure generated by an overlying column of fluid is thus termed the hydrostatic pressure.

### Pressure and the Gas Laws

The upper boundary of the air column that gives rise to atmospheric pressure is the vacuum of space. Being rather light, the mass of a column of air with a 1 cm2 cross section is almost exactly 1 kg.

If a much heavier liquid substance is used to balance this air column, only a relatively small length would be needed.

• 6.3: Relationships among Pressure, Temperature, Volume, and Amount
• What’s the relationship between pressure and volume of gas?

Gas Laws One of the most amazing things about gases is that, despite wide differences in chemical properties, all the gases more or less obey the gas laws. The gas laws deal with how gases behave with respect to pressure, volume, temperature, and amount. Pressure Gases are the only state of matter that can be compressed very tightly or expanded to fill a very large space. Pressure is force per unit area, calculated by dividing the force by the area on which the force acts. The earth's gravity acts on air molecules to create a force, that of the air pushing on the earth.

This is called atmospheric pressure. The units of pressure that are used are pascal Pastandard atmosphere atmand torr.

## Boyle's law

It is normally used as a standard unit of pressure. The SI unit though, is the pascal. For laboratory work the atmosphere is very large. A more convient unit is the torr. A torr is the same unit as the mmHg millimeter of mercury. It is the pressure that is needed to raise a tube of mercury 1 millimeter.