# Investigate the temperature and volume relationship for a gas

### Volume and temperature relationship of a gas – Charles' law - Pass My ExamsPass My Exams

Because of this, the P–T relationship for gases is known as either simulation link to investigate the relationships between pressure, volume, temperature. and . Apr 20, From the data obtained, the relationship between the volume and temperature of a fixed mass of gas at constant pressure is determined. Volume or Temperature of a Gas Affect the Pressure of That Gas? Introduction In this investigation you will explore the relationship between volume.

## 6.3: Relationships among Pressure, Temperature, Volume, and Amount

By extrapolating this graph to low temperatures, one can predict the temperature at which the volume of the gas should become zero. This temperature, called absolute zero, is considered to be an estimate of the lowest possible temperature. Actually all gases condense before this temperature is reached. The quantitative relationship between the volume and temperature of a fixed sample of ideal gas at constant pressure is called Charles' Law.

Hazards Metallic mercury forms a poisonous vapor. Precautions Because the capillary tubes are somewhat fragile, be careful with them.

## Temperature-Volume Relationship of a Gas

Like mercury thermometers, they should not be used as stirrers. Procedure Set up a boiling water bath. Heat enough water to nearly fill the cylinder.

Place a rubber band marker on a capillary tube. Move the rubber band to the bottom of the mercury plug. Measure the distance from the rubber band marker to the bottom of the air space. Measure and record the room temperature. Transfer boiling water from the beaker to the cylinder. Use beaker tongs or a pot holder.

### Temperature-Volume Relationship of a Gas

Immerse a capillary into the cylinder. Allow the system to equilibrate.

The gas will expand moving the plug up. Measure and record the temperature of the water.

Remove the capillary from the cylinder. More mercury is then poured into the open arm to increase the pressure on the gas sample. The pressure on the gas is atmospheric pressure plus the difference in the heights of the mercury columns, and the resulting volume is measured.

This process is repeated until either there is no more room in the open arm or the volume of the gas is too small to be measured accurately. This relationship between the two quantities is described as follows: Dividing both sides of Equation 6.

The numerical value of the constant depends on the amount of gas used in the experiment and on the temperature at which the experiments are carried out. At constant temperature, the volume of a fixed amount of a gas is inversely proportional to its pressure. 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.

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.

### Relationships among Pressure, Temperature, Volume, and Amount

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.