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.
实验室水平的吸附式天然气（ANG）储气只需用CNG约1/6的压力即可达到其3/4的体积能量存储密度。
The volumetric storage density of ANG can be 3/4 of CNG at 1/6 the gas pressure in laboratory research.
在以氢和天然气为主的车用燃气的存储技术中，吸附存储材料以其密度小、吸脱气体速度快等优点使吸附存储成为一类极具发展潜力的存储技术。
Among the storage technologies of automotive fuel gases (hydrogen and nature gas), adsorption storage is a promising technology for the low density and fast desorption of adsorption storage materials.
通过对天然气在螺旋弯曲和正弦弯曲流道内的流动速度、密度和螺旋度进行研究，得到天然气对弯曲油管的作用力。
After studied the natural gas flow speed, density and helicity in the spiral and sine flow channel, the effects of natural gas to the bending tubing was obtained.
通过对天然气在螺旋弯曲和正弦弯曲流道内的流动速度、密度和螺旋度进行研究，得到天然气对弯曲油管的作用力。
After studied the natural gas flow speed, density and helicity in the spiral and sine flow channel, the effects of natural gas to the bending tubing was obtained.
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