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Single-stage vacuum pumps typically produce vacuum to 35 torr (mm Hg) or 47 millibars (4.7 kPa), and two-stage pumps can produce vacuum to 25 torr, assuming air is being pumped and the ring-liquid is water at 15 °C (59 °F) or less. Dry air and 15 °C sealant-water temperature is the standard performance basis, which most manufacturers use for ...
There have been incidents of babies suffocating while in carriers, particularly "bag sling" styles, and Consumer Reports urged a recall of all slings of this type in 2009. [11] [12] [13] Consumer Reports recommends soft infant carriers (mei tai or soft structured carriers) and backpack baby carriers over these styles. [14]
Electric breast pumps are larger than manual ones, but portable models are available (e.g. in a backpack or shoulder bag). Some models include battery packs or built-in batteries to enable portable operation of the pump. Some electric pumps allow multi-user operation but recommend an accessory kit for each user to maintain cleanliness. [26]
The term carrycot became more common in the UK after the introduction of lighter units with detachable baby carriers in the 1970s. As they developed through the years suspension was added, making the ride smoother for both the baby and the person pushing it. The word pram is etymologically a shortening of its now less common synonym perambulator.
Its construction and principle of operation is simple. It consists of a titanium filament through which a high current (typically around 40 A) is passed periodically. This current causes the filament to reach the sublimation temperature of titanium, and hence the surrounding chamber walls become coated with a thin film of clean titanium.
Even at this temperature, the lighter gases helium and hydrogen have very low trapping efficiency and are the predominant molecules in ultra-high vacuum systems. Cryopumps are often combined with sorption pumps by coating the cold head with highly adsorbing materials such as activated charcoal or a zeolite .
Babywearing is the practice of wearing or carrying a baby in a sling or in another form of carrier. Babywearing has been practiced for millennia [ 1 ] around the world. Babywearing is a form of baby transport which can be used for as long as mutually desired, often until toddlerhood and beyond. [ 2 ]
In the field of oil regeneration and re-refining, vacuum pumps create a low vacuum for oil dehydration and a high vacuum for oil purification. [44] A vacuum may be used to power, or provide assistance to mechanical devices. In hybrid and diesel engine motor vehicles, a pump fitted on the engine (usually on the camshaft) is used to produce a vacuum.