Other advantages of the propellent with a negative pressure exponent were also presented.

还指出了负压力指数推进剂的其它优点。

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As water is lost from the surface of the leaves, a negative pressure, or tension, is created.

由于水从叶子表面丧失，一个负压力，或张力就得以产生。

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The utility model discloses a negative pressure generator used by a water pump suction pipe without a bottom valve.

本实用新型公开了一种无底阀水泵吸水管用负压发生器。

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So if delta v is negative, in this case delta v is negative, OK, delta v is negative, pressure is a positive number, negative times negative is positive, work is greater than zero.

也就是当活塞,压缩气体的时候，做的功是正的，按照这一规定,我们需要在这里，加上一个负号，这是习惯规定。

麻省理工公开课 - 热力学与动力学课程节选

The two companies disagreed about who was in charge of interpreting a negative pressure test that could have warned workers of the problems.

BBC: Transocean agrees to pay $1.4bn oil spill fine

In other words the iron lung is sealed and attached to bellows, which lower the air pressure inside the iron lung to create a negative pressure.

CNN: 'I lived in an iron lung for seven years'

Bartlit emphasized in his letter Thursday that cementing failures are a known hazard in the oil industry, with specific tests such as a "negative pressure test" and "cement evaluation logs" designed to identify cementing problems.

CNN: STORY HIGHLIGHTS