It is designed to deliver air at a set volume
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positive pressue ventilation is usually provided by a mechanical ventilator. A blend of oxygen and air coming out of the ventilator. The FiO2 is set on the ventilator. The person gets the FiO2 set on the ventilator.The manual positive pressure ventilation is by resuscitating with a self inflating bag usually provided with oxygen. FiO2 is fractional inspired oxygen and does not change with positive pressure ventilation or negative pressure ventilation. Manual bagging FiO2 may be changing according to supply of oxygen, inhalation (speed and volume) and frequency of bagging.
Unless you are in a reality where nothing has to do with itself, volume has everything to do with volume as it is itself.
volume = mass / volume volume = 100 / 20 volume = 5
The volume of a gas is the same as the volume of its container.
Volume = mass / Density Mass = Volume * Density Density = Mass / Volume