Microbar is a term used in atmospheric science to describe a pressure unit equal to one millionth of a bar. However, there are a few synonyms for this term that can be used interchangeably. One synonym is the micron, which is also a metric unit of pressure equal to one millionth of a meter of mercury or one millionth of a bar. Another synonym for microbar is the micropascal. This is a unit of pressure that is equal to one millionth of a pascal. Similarly, the term micrometer of mercury is also sometimes used as a synonym for microbar. Ultimately, these terms can be used synonymously with microbar depending on the situation and context.