Vacuum Techniques

In this experiment you will learn about vacuum technology and how to use it for measurements.

Questions

  1. 1. Calculate the conductivity of a tube for air at room temperature if the average pressure is 10 Torr, the diameter of the tube is of 0.2 cm, and the length of the tube is 10 cm. What is the conductivity of the same tube at a pressure of 1×10-3Torr ?
  2. What vacuum gauge is suitable for measurement of a pressure of 100 Torr?
  3. If the rotor of the rotary pump performs 5000 revolutions per minute and the volume between the vanes is 20 ml, what will be the pumping speed of that pump (in units of m3/hour)? What will be the pumping speed of the system constructed from this pump and the tube described in problem 1?
  4. What force must be applied in order to open the vacuum system shown in the figure below if the pressure in the vacuum system is 300 Torr