Salt has lower density than the surrounding rock, so it tends to flow upwards, pushing up the overlying layers of rock to form a dome.

盐的密度低于周围的岩石，所以会向上抬升，使覆盖其上的岩层形成穹顶状。

youdao

Compared with conventional metallic materials, advanced ceramics have higher melting point, higher hardness, lower density, better anticorrosion property and wear resistance, etc.

陶瓷材料具有熔点高、硬度高、密度小、耐腐蚀、抗氧化等诸多优点，在冶金、化工、机械、宇航等领域已得到较多应用。

youdao

Although the sintered magnet has lower density, its magnetic properties are good.

虽然烧结体的密度相对较低，但仍具有较优良的磁性能。

youdao

Light crudes have low wax content, with lower density and API viscosity.

FORBES: Obama Released the SPR, and All He Got Was...Nothing

The lower density means dramatically less drag force acting on the spinning disk stack so that mechanical power into the motor is substantially reduced.

ENGADGET: HGST develops helium-filled, high-capacity hard drives: no, they won't float away

For the most part, this means areas that offer the best mix of job opportunities, reasonable housing costs and, for the most part, lower density living.

FORBES: America's Baby Boom And Baby Bust Cities