The cloud height, more commonly known as cloud thickness or depth, is the distance between
the cloud base and the cloud top. It is traditionally expressed either in metres or as a
pressure difference in hectopascal (hPa, equivalent to millibar). Sometimes, the expression
cloud height is used instead of cloud base, in which case the context has to clarify whether
the intent is to designate the height of the base of the cloud or the size of it.