Bar - is a widely used metric unit of measure for pressure and 1 bar converts precisely to 100,000 Pascals.
Kilopascal (kPa) - is a 1000x multiple of the Pascal unit which is the SI unit for pressure. 1 Kilopascal equals 1,000 Pascals.
Megapascal (MPa) - is a 1000000x multiple of the Pascal unit which is the SI unit for pressure. 1 Megapascal equals 1,000,000 Pascals.
Millibar (mbar, mb or mbr) - is a metric unit of pressure mainly used in European countries and is derived directly from the Bar pressure unit which equals 1,000 mbar. In SI units 1 mbar equals 100 Pascals.
Pascal (Pa) - is the SI unit for pressure and is derived from other SI units using the following relationships: Pa = (kg.m/s²)/m² = kg/m.s² = N/m². Since 1 pascal is a very low pressure being 1/100 of a millibar it's use is limited to ultra low pressure applications such as measuring the pressure differences in ventilation systems.
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删除1. What is the principle of ultrasonic level measurement?
Ultrasonic waves detect an object in the same way as Radar does it.
Ultrasonic uses sound waves, and Radar uses radio waves.
When the ultrasonic pulse signal is targeted towards an object,
it is reflected by the object and echo returns to the sender.
The time traveled by the ultrasonic pulse is calculated,
and the distance of the object is found.
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