<Dt> Vibrating element transducers </Dt> <Dd> This type of instrument requires a vibrating element to be placed in contact with the fluid of interest . The resonant frequency of the element is measured and is related to the density of the fluid by a characterization that is dependent upon the design of the element . In modern laboratories precise measurements of specific gravity are made using oscillating U-tube meters . These are capable of measurement to 5 to 6 places beyond the decimal point and are used in the brewing, distilling, pharmaceutical, petroleum and other industries . The instruments measure the actual mass of fluid contained in a fixed volume at temperatures between 0 and 80 ° C but as they are microprocessor based can calculate apparent or true specific gravity and contain tables relating these to the strengths of common acids, sugar solutions, etc . The vibrating fork immersion probe is another good example of this technology . This technology also includes many coriolis - type mass flow meters which are widely used in chemical and petroleum industry for high accuracy mass flow measurement and can be configured to also output density information based on the resonant frequency of the vibrating flow tubes . </Dd> <Dl> <Dt> Ultrasonic transducer </Dt> <Dd> Ultrasonic waves are passed from a source, through the fluid of interest, and into a detector which measures the acoustic spectroscopy of the waves . Fluid properties such as density and viscosity can be inferred from the spectrum . </Dd> </Dl> <Dd> Ultrasonic waves are passed from a source, through the fluid of interest, and into a detector which measures the acoustic spectroscopy of the waves . Fluid properties such as density and viscosity can be inferred from the spectrum . </Dd>

What is meant by specific gravity in tamil