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From a nursing perspective...

The gauge of the needle tells us the size of the lumen (inside) of the tube. Size 18 is big whilst size 30 is small. If we want a substance that we're injecting to have low pressure (ie if cleaning a wound with saline and not wanting it to hurt or disturb the healing and using a syringe to apply it) then we use a large size (ie 16).

Hope this helps

Gauge pressure is the pressure recorded on the gage that records above the atmospheric pressure. Normal atomospheric pressure is 14.7psi. So if a gage read 10 psi of gage pressure, then the true pressure would be 24.7 psi.

Hope this is right.

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10y ago

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Gauge pressure is the pressure measured relative to atmospheric pressure, while absolute pressure includes atmospheric pressure as a reference point. To accurately gauge pressure in a system, one can use a gauge that measures gauge pressure and then add the atmospheric pressure to get the absolute pressure. This allows for a more precise measurement of the pressure within the system.


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