比面积 meaning in English

area per unit volume
specific area
specific surface

Natural gas desorption performance on activated carbon with super - high specific surface area
超高比面积活性炭上天然气脱附性能研究
The area lit by the sun s ray is greater at a than at b . so , the solar energy falling on a unit area is greater at the tropics than at higher latitudes
图二阳光照射地球，地面上面积a比面积b小，所以在热带地区每单位面积所接收到的太阳能比较高纬度地区大。
Determination of the area per unit mass of powders specific surface by means of gas adsorption . b . e . t . method : volumetric measurement of the adsorption of nitrogen at low temperatures
用气体吸附法测定粉末的单位质量面积比面积. bet法：低温下氮吸附的容量测定法