How to make the manometer

Manometers – devices for measurement of pressure of liquids or gases – happen different designs. The simple manometer for measurement of pressure of air, for example, in an inner or bicycle tube, it is possible to make with own hands. Depending on the power of a spring and durability of the case they can measure also pressure of oil. It will be suitable for school experiments at physics lessons. Besides it is possible to make it together with children.

It is required to you

• - Single syringe
• - A metal spring which diameter is equal to diameter of a cylinder of the syringe
• - Needle
• - Spirit or gas burner
• - Glue "Moment"
• - Passatizhi
• - Nippers

Instruction

1. Take the single syringe and to a limit you will put forward from it the piston. Cut off a piston rod so that there was a piece about 1 cm long. Warm the remained piece of a rod by means of the gas burner and a zaplavta in it one of the ends of a spiral spring.

2. Enter the piston back into a syringe cylinder so that outside there was a small piece of a spring, and big part would be in a cylinder.

3. Warm a needle and puncture with it a syringe cylinder from outside, opposite to a tip, near edge. By means of passatizhy attach the end of a spring to a needle. Bite off an excess part of a spring. The spring manometer turned out.

4. If from a syringe tip instead of a needle to put a rubber tube and to connect it to the capacity or the pipeline in which pressure is measured the piston in a cylinder will move concerning a scale of divisions on the case of the syringe, having indicated thus pressure in the highway or the studied capacity.

5. It is recommended to otgraduirovat previously a scale on the known source of pressure. Make a scale binding to pressure units on a reference source. For this purpose take the call from transparent material and fill it with water up to the certain height. On the other hand connect a rubber tube with the manometer. Mark a scale on height of a water column under Torricelli's law. On the place where the piston moved, make a mark of the received pressure. Having changed an amount of water in a tube, put the following marks.

Author: «MirrorInfo» Dream Team