At the end of this session, the students will able to: 

• Define key terms written in bold.
  
• Explain the physical properties of gas and gas law.
  
• Describe the gases which are used in anesthesia practice.
  
• Explain the sources of medical gases to anesthesia machine.
  
• Describe the methods of connecting cylinder with anesthesia machine.
  
• Explain the use of pressure regulator, valve and flow meter. 
• Explain the methods of identifying medical gases.
  
• List the safe practices in using the cylinder.