A partnership business may be established without any formality although the partners have certain unavoidable…
WATER VAPOUR IN THE ATMOSPHERE
As a result of evaporation from oceans and seas, water is absorbed into the air as a gas known as water vapour.
The actual amount of water vapour the air can hold varies with the temperature-the warmer the air, the more water vapour it can hold. The graph (Fig. 14.10) clearly indicates this.
There is a limit, however, to the amount of water vapour a given quantity of air can hold. This limit depends on its temperature. When the air has reached this limit it is said to be saturated. If warm air is cooled, a temperature will be reached at which the water vapour that is present will be sufficient to saturate the air. If the air is further cooled beyond the saturation point, the excess water vapour will be condensed out in the form of water. The temperature at which condensation occurs is known as the dew point.
Humidity
The actual amount of water vapour in the air is called the absolute humidity of the air. It can be expressed as so many grams of moisture per cubic metre of air. However, of much greater importance is the Relative Humidity. This is the actual amount of water vapour in the air compared with the amount of water vapour the air could hold if it were saturated-this is usually expressed as a percentage. If we examine the graph (Fig. 14.10), it will be noticed that air at 35°C can hold 39.6 grams of moisture per cubic metre. However, if this air is only holding 10 grams of moisture per cubic metre at this temperature, then its relative humidity is calculated as follows:
