石油和天然气的密度都比水小，所以二者通常会浮在被水浸泡的岩石和沉积物的表层。
Both oil and gas are less dense than water, so they generally tend to rise upward through water-saturated rock and sediment.
页(泥)岩密度计是石油及天然气地质勘探中现场随钻测量页(泥)岩密度的专用计量器具。
Shale (mudstone) densimeter is a special instrument used to measure shale (mudstone) density during drilling in geological exploration for oil and gas.
车用天然气燃料中，液化天然气(LNG)具有压力不高、能量密度大、续驶里程长的优点，是理想的车用燃料。
Liquefied natural gas (LNG), as a vehicle fuel, has the advantages of low pressure, big energy density, and long driving distance. It is an ideal vehicle fuel.
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