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The standard liter per minute (SLM or SLPM) is a unit of (molar or) mass flow rate of a gas at standard conditions for temperature and pressure (STP), which is most commonly practiced in the United States, whereas European practice revolves around the normal litre per minute (NLPM). [1]
The oxygen delivered while the patient exhales or pauses is not used. Say for example the machine delivers 2 liters per minute, the respiratory minute volume is 10 liters and the patient inhales 50% of the time, then the total amount inhaled will be 1 liter from the machine (50% of the output) and 9 liters ambient air.
Climbers sometimes carried only two cylinders each. Four cylinders contained a total of 960 litres of oxygen, which would last for eight hours at the standard rate of 2 litres per minute or seven hours at 2.2 L/min. [32] The attempt on Everest by George Mallory and Andrew Irvine in 1924 was the first summit attempt using oxygen on Everest. [31]
Older units cycled for a period of about 20 seconds and supplied up to 5 litres per minute of 90+% oxygen. Since about 1999, units capable of supplying up to 10 L/min have been available. Classic oxygen concentrators use two-bed molecular sieves; newer concentrators use multi-bed molecular sieves.
With continuous flow units, oxygen delivery is measured in LPM (liters per minute). Providing continuous flow requires a larger molecular sieve and pump/motor assembly, and additional electronics. This increases the device’s size and weight (approximately 18–20 lbs). [13]
V̇O 2 max is expressed either as an absolute rate in (for example) litres of oxygen per minute (L/min) or as a relative rate in (for example) millilitres of oxygen per kilogram of the body mass per minute (e.g., mL/(kg·min)). The latter expression is often used to compare the performance of endurance sports athletes.
≡ 1 cm/s 2 = 10 −2 m/s 2: inch per minute per second: ipm/s ≡ 1 in/(min⋅s) = 4.2 3 × 10 −4 m/s 2: inch per second squared: ips 2: ≡ 1 in/s 2 = 2.54 × 10 −2 m/s 2: knot per second: kn/s ≡ 1 kn/s ≈ 5.1 4 × 10 −1 m/s 2: metre per second squared (SI unit) m/s 2: ≡ 1 m/s 2 = 1 m/s 2: mile per hour per second: mph/s ≡ 1 mi ...
The earliest, and most widely used form of adult nasal cannula carries 1–3 litres of oxygen per minute. Cannulae with smaller prongs intended for infant or neonatal use can carry less than one litre per minute. Flow rates of up to 60 litres of air/oxygen per minute can be delivered through wider bore humidified nasal cannula.
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