A millibar is a unit for measuring air pressure: how hard the mixture of gases around the Earth is pressing. Weather people use it on maps; a falling number often means a storm is coming.

A millibar一個millibar（毫巴） is a unit是一個單位 for measuring air pressure用來量氣壓：how hard地球周圍的氣體混合物 the mixture of gases around the Earth is pressing壓得有多用力。Weather people氣象人員 use it會用它 on maps在地圖上；a falling number數字下降 often means常常代表 a storm is coming暴風雨要來了。

Milli- means one thousandth, so a millibar is one thousandth of a bar. In practice one millibar is the same size as one hectopascal (hPa), which is the name many weather services print now. So millibar is a slightly older name for the same everyday weather unit.

Milli-Milli- means指的是 one thousandth千分之一，so所以 a millibar一個millibar is one thousandth of a bar就是一bar的千分之一。In practice實際上 one millibar一個millibar is the same size as跟 one hectopascal (hPa)一個百帕（hPa）大小一樣，which is the name這是 many weather services print now很多氣象單位現在會印的名稱。So所以 millibarmillibar is a slightly older name是稍微舊一點的名稱 for the same everyday weather unit講的是同一個日常氣象單位。

You will see mb or mbar in older books and in aviation; you will see 百帕 on a Taiwan forecast. It is science English, not slang. It has nothing to do with a mill that grinds flour.

You你 will see會看到 mb or mbar「mb」或「mbar」 in older books and in aviation在較舊的書和航空領域裡；you你 will see會看到 百帕百帕 on a Taiwan forecast在台灣的天氣預報上。It它 is science English是科學英文，not slang不是俚語。It它 has nothing to do with跟…沒有關係 a mill that grinds flour磨麵粉的mill磨坊。