Pressure and gases Flashcards
Define pressure
pressure is defines as force per unit area.
in a solid object pressure = force/ area
- pressure depends upon both force and the area over which the force is applied
Pressure is measured in _____
Pascal (Pa)
pressure if 1 newton over _____ square metre
1
what are the pressure measurements in healthcare
- mmHg : millimetres (mm) of mercury (Hg)
- cmH2O : centimetres (cm) of water (H2O)
- Psi - pounds per share inch
Where do you use mmHg
Used today in healthcare situations such as measuring blood pressure and inspiratory and expiratory pressures (this is connected to atmospheric pressure)
Where do you use cmH2O
used in the measurement of central venous pressure.
Where do you use Psi
used to measure pressure of compressed gases and direct pressure on an object.
Static liquid
evenly distributed pressure in all directions
Fluid in container
subject to effects related to volume and atmospheric pressure/gravity.
Bernoulli effect/Venturi barrel
principle of entertainment.
pressure for IV fluids
The higher the fluid container (IV Bag) the faster the outward flow of the fluid to the patient.
pressure for Spring use
pressure is higher from smaller syringes
- important when administrating intravenous drugs.
