Propeller meters introduce small pressure losses .

螺旋浆式流量计的压力损失小。

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We can assume that the liquid is incompressible over that small pressure change.

变化下，液体是不可压缩的。

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It can be used to measure the pressure, but also can be used to measure small pressure.

它既可以用来测量大的压力，也可以用来测量微小的压力。

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Let's say we start from some V1 and p1 here, so high pressure, small volume and we end up with a high volume low pressure, under constant temperature condition.

例如我们要从压强比较高，体积比较小V1，p1出发,到达低压强，大体积的末态，过程中温度不变。

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As long as small business owners can get more work out of existing employees without raising their pay, there will be little pressure for small businesses to hire.

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That kind of offer can put pressure on small and medium-size business owners depending on their business model.

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