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U-tube manometer 369,370
-, closed manometer 372
-, open manometer 372
UHV dosing valve, see ‘bakeable UHV precision dosing valve’
ultimate pressure
-, definition 165
-, measurement of 506
ultra-high vacuum 219,358,368,515
Ultralen oil 224
ultrasonic (vapour) bath 652
ultrasonic cleaning line 652
unalloyed steel 634
unit conversion factors 661
universal gas constant 23