Probability Definition. The probability of an event is a number between $0$ to $1$ which measures the chance of that event occurring. The likelihood of the occurrence of the event increases as the probability varies from $0$ to $1$. The probability of the occurrence of an impossible event is $0$ and that of a certain to occur event is $1$.
As altitude increases, air pressure decreases. Gravity causes the atmosphere to become heavier the closer you are to the ground. The atmosphere may seem weightless but all the â¦ air molecules add up to a tremendous amount of mass.
The high altitude [high altitude: A measure of an area's height above sea level.] of the land. Temperatures decrease approximately 1Â°C for every 100 m increase in height. Cold air cannot hold as much water vapour as warm air, so precipitation is less likely.he high altitude [high altitude: A measure of an area's height above sea level.] of the land. Temperatures decrease approximately 1Â°C for every 100 m increase in height. Cold air cannot hold as much water vapour as warm air, so precipitation is less likely.