The Role of Probability. Basic Concepts of Probability. A probability is a number that reflects the chance or likelihood that a particular event will occur. Probabilities can be expressed as proportions that range from 0 to 1, and they can also be expressed as percentages ranging from 0% to 100%.
Thus, when people hypoventilate (i.e. causing an increase in CO2) this causes the pH in your blood to decrease, making it more acidic. (and when hyperventilation occurs, O2 is increased, which causes an increase in pH - making blood more basic).
Frost nip and frost bite - Both of these handily descriptive conditions can physically damage bits of your body. Frost nip happens when part of your body becomes so cold that the blood flow slows because that area is losing too much heat and is starting to be sacrificed (yes you should be worried by this prospect!).