Count per Liter

Count (or number) per liter is used to measure number density in a variety of domains. Many scientific research questions require a means to measure the frequency or count of discrete entities in a given unit of volume. For instance, medical professionals often make measurements on the blood of patients, such as the Complete Blood Count using counts per liter units. Some measures of water quality use counts of micro-organisms per liter of water. In archaeology, counts per liter are used to measure the number density of artifacts or ecofacts in archaeological deposits.