The hectopascal is the most common unit for atmospheric pressure. It replaced the equivalent millibar to match SI units. Standard atmospheric pressure at sea le

The hectopascal is the most common unit for atmospheric pressure. It replaced the equivalent millibar to match SI units. Standard atmospheric pressure at sea level is 1013 hPa. Hectolitres are commonly used in the food and drink industry. For example wineries and breweries typically measure their production in hectolitres. Not exactly hecto but land, especially farm land is often measured in hectares. It is a non-SI metric unit equivalent to the square hectometer or 10000 square meters. We most likely kept the name because "hectare" sounds better than "square hectometer". As expected, 1 hectare is worth 100 ares, but ares and its other multiples are much less used than hectares.