Compositions and Values

Blood Gas Values   Composition of Air   Consistency of Soda Lime   Mac Values   Bimetallic Strip  

Blood Gas - normal values

PC0².....................4.8 - 5.9 kpa

...............................35 - 45 mmHg

MC0²...................23 - 28 mmol/L

PO².......................11.3 - 13.3 kpa

................................82 - 100 mmHg

PH..........................7.36 - 7.42

> PH = Acid

< PH = Alkali

Composition of Air

Nitrogen...................78.03%

Oxygen.....................20.99%

Argon.........................0.93%

Carbon Dioxide.....0.03%

Neon...........................0.0015%

Hydrogen.................0.001%

Helium.......................0.0005%

Krypton....................0.0001%

Xenon........................0.000008%

Consistency of Soda Lime

Calcium Hydroxide 94%

Sodium Hydroxide 5%

Potassium Hydroxide 1%

Silicates >1%(for binding)

Mac Values in O²

Halothane.................0.7%

Isoflurane................1.2%

Ethrane......................1.6%

Sevoflurane.............2.0%

Desflurane...............6.0%

Bimetallic Strip

Invar

An alloy of Iron with 36% Nickel, which expands by only 0.9mm per km for each centigrade degree temperature rise. This is one tenth the expansion of platinum and titanium and less than one twentieth of that of most other metals.  It was discovered in 1896

Brass

An alloy of Copper and Zinc. Brasses containing less than 36% Zinc are ductile when cold and can be easily worked into complex shapes.

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