Hypothermia is one of the biggest risks to your life at high altitude. Hypothermia is defined as a core temperature below 35 degrees. It is broadly categorised into: Mild hypothermia (32-35 degrees C) Moderate hypothermia (30-32 degrees C) Severe hypothermia (<30 degrees C)
Churn rate. Churn rate (sometimes called attrition rate), in its broadest sense, is a measure of the number of individuals or items moving out of a collective group over a specific period. It is one of two primary factors that determine the steady-state level of customers a business will support.
When talking about subscribers or customers, sometimes the expression survival rate is used to mean 1 minus the churn rate. For example, for a group of subscribers, an annual churn rate of 25% is the same as an annual survival rate of 75%. Both imply a customer life time of 4 years.