BT_GS 1.23 Describe the physical properties of inhalational agents, including the principles of vaporisation

T / F  At sea level the carrier gas leaving a sevoflurane vaporising chamber always contains approx. 21% sevoflurane.

T / F  With increasing altitude, a vaporiser progressively delivers a lower partial pressure of anaesthetic than what is intended..

T / F  At their boiling point, all substances have a saturated vapour pressure equal to the atmospheric pressure.

T / F  A liquid becomes cold as it is vaporised, because heat energy contained in the liquid is converted to kinetic energy in the molecules which are escaping as a vapour.

T / F  To maintain a constant temperature of the liquid anaesthetic, vaporisers are constructed of a good insulator such as copper.

Two bonus questions 🙂

  1. Our vaporisers are often referred to as “plenum” vaporisers. What does plenum mean in this context?
  2. The anaesthetic apparatus shown above includes a vaporiser. How does it work in conjunction with the breathing system shown?

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