Measurement Ne Demek
Marcelene Pape
A unit measure used in marine transport to compare the volume and weight of a shipment. Freight rates are usually expressed in terms of cost per revenue ton. There are three different formulas in general use for determining the total number of revenue tons in a given shipment when the freight is calculated on a weight or measurement basis:
A wide variety of probes are available to measure turbidity -- thedegree to which light is scattered by particles suspended in a liquid. Themeasured turbidity, however, depends on the wavelength of light and the angleat which the detector is positioned. For various reasons, turbidity probesdo not all use the same light sources, angles of measurement to detect thescattered light, and signal processing strategies. As a result, measurementsfrom different makes/models of turbidity probes may not be comparable to oneother.
To help categorize the differences in turbidity probe design and distinguishamong turbidity measurements that may not be comparable, new units ofmeasurement were established in 2004 and assigned based on the probe design.The following table summarizes the units and the characteristics of the probesassigned to those units. The differences are based mainly on the wavelengthof the light used to make the measurement, the angle at which the scatteredlight is detected, the number of detectors, and any special signal processing.For example, a Formazin Nephelometric Unit (FNU) is similar to a NephelometricTurbidity Unit (NTU) in that both measure scattered light at 90 degrees fromthe incident light beam, but the FNU is measured with an infrared light sourceaccording to the ISO 7027 method whereas the NTU is measured with a white lightaccording to EPA method 180.1. A great many submersible, multiparameterturbidimeters use an infrared light source.
Because suspended particles scatter light of different wavelengths withvarying efficiency, turbidity data collected with infrared light sources arenot directly comparable to turbidity data collected with white light sources.Always be careful when using turbidity data that have different units ofmeasurement; data of different units are not necessarily comparable.
Select one or more objects. In the Property Inspector, perform simple math in any box that accepts numeric values. For example, if you want to move a selected object 3 units to the right using the current measurement units, enter +3 after the current value.