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In very deep water they can be lowered on cables from the surface. The primary usage is for oceanography. [4] The instruments can also be used in rivers and canals to continuously measure the discharge. Mounted on moorings within the water column or directly at the seabed, water current and wave studies may be performed. They can stay ...
Water activity values can also help limit moisture migration within a food product made with different ingredients. If raisins of a higher water activity are packaged with bran flakes of a lower water activity, the water from the raisins migrates to the bran flakes over time, making the raisins hard and the bran flakes soggy.
A Coriolis water meter is a precision instrument used to measure the mass flow rate and density of fluids, including water, by utilizing the Coriolis effect. Unlike traditional mechanical meters with moving parts, Coriolis meters use oscillating tubes through which the fluid flows.
An instrument of this type is the Acoustic Doppler current profiler (ADCP), which measures the water current velocities over a depth range using the Doppler effect of sound waves scattered back from particles within the water column. The ADCPs use the traveling time of the sound to determine the position of the moving particles.
Light meter, an instrument used to set photographic exposures. It can be either a lux meter (incident-light meter) or a luminance meter (reflected-light meter), and is calibrated in photographic units. Integrating sphere for collecting the total luminous flux of a light source, which can then be measured by a photometer
Moisture meters are measuring instruments used to measure the percentage of water in a given substance, as physical properties are strongly affected by moisture content and high moisture content for a period of time may progressively degrade a material. Meters exist for various substances, including wood, building materials, concrete, and soil.
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