Definition of spectrometer. 1  1 : an instrument used for measuring wavelengths of light spectra. 2  2 : any of various analytical instruments in which an emission (as of particles or radiation) is dispersed according to some property (as mass or energy) of the emission and the amount of dispersion is measured nuclear magnetic resonance spectrometer.
1 bar is equal to 1000 millibars. Just like how there are 1000 millilitres in a litre, and 1000 milliseconds in a second. 1 millibar = 0.001 bars.
Pressure is measured in Pascals in the metric system, but barometers are often calibrated in inches of mercury or millibars (1 millibar = 1 hectoPascal = 100 Pascals). Divide the reading in inches of mercury by 0.0295 to convert it to a pressure in millibars.Some continental barometers are calibrated in centimetres of mercury. To convert this to a reading in millibars, first multiply the number of cm by 2.54 to get to inches of mercury, and then divide by 0.0295 as above.ivide the reading in inches of mercury by 0.0295 to convert it to a pressure in millibars. Some continental barometers are calibrated in centimetres of mercury. To convert this to a reading in millibars, first multiply the number of cm by 2.54 to get to inches of mercury, and then divide by 0.0295 as above.