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# hydraulic

«hydraulic» in Mova's school dictionary: **Worked by the pressure of a liquid, usually oil or water…** — its meaning for a pupil, its sense in the lessons and examples.

### part of speech

adjective (hydraulic); noun «hydraulics» (uncountable — the science, or the hydraulic parts of a machine)

### meaning for a pupil

1) Worked by the pressure of a liquid, usually oil or water, pushed through pipes. [tree →](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/H/hydraulic/#m1)

2) To do with moving water, for example in dams, canals and pipes: hydraulic engineering. [tree →](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/H/hydraulic/#m2)

3) (of cement) Able to set hard under water. [tree →](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/H/hydraulic/#m3)

### sense in the lessons

In science and design-technology lessons, hydraulic systems show how a small push on liquid in a narrow pipe can make a big force in a wide pipe — this is how car brakes, diggers, car lifts and dentists' chairs work. Children build hydraulic models with syringes and water. Phrases: hydraulic lift, hydraulic brakes, hydraulic arm, hydraulic press, hydraulic pump.

### examples

- The digger's hydraulic arm lifted the heavy rocks. [tree →](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/H/hydraulic/#x1)
- We made a hydraulic robot arm using syringes and coloured water. [tree →](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/H/hydraulic/#x2)
- The mechanic raised the car on a hydraulic lift. [tree →](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/H/hydraulic/#x3)
- Cars stop using hydraulic brakes. [tree →](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/H/hydraulic/#x4)
- The dentist's chair moves up with a hydraulic pump. [tree →](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/H/hydraulic/#x5)
- A hydraulic press can squash a can flat. [tree →](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/H/hydraulic/#x6)
- The engineer studied hydraulics to design the dam. [tree →](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/H/hydraulic/#x7)

### note

«Hydraulic» is an adjective; «hydraulics» is the noun for the subject. Compare «pneumatic» — worked by air or gas pressure instead of liquid. The idea: liquids are very hard to squash, so pressure passes through them. In maths/science, pressure = force ÷ area, so a bigger piston gets a bigger force from the same pressure.

### Trees and pragmatics

[Every meaning and example of «hydraulic» parsed by Mova](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/H/hydraulic/), each sentence with its dependency tree and frames.