Dalton - A unit of
molecular mass approximately equal to the mass of a hydrogen atom.
Decibel- (dB) A logarithmic measure of the
relative power, or of the relative values of two flux densities, especially of
sound intensities and radio and radar power densities.
Degree(angle)- A degree (or in full
degree of arc), usually symbolized by the symbol is a measurement of plane
angles, or of a location along a circle of a sphere (such as the Earth or the
celestial sphere), representing 1/360 of a full rotation.
Degree(temperature)- A
unit used in several scales of temperature.
Diopter- A a unit of curvature equal to one per meter
(inverse meters or 1/meter); a circle with radius 1/2 meter has a curvature of 2
diopters. Dobson Unit-A
unit used in the measure of the column abundance of ozone in the atmosphere; one
Dobson unit is the equivalent of 2.69 × 1016 molecules of ozone per square
centimeter (Alternatively, 1 Dobson unit corresponds to a layer of ozone 10 m
thick, if the ozone were held at standard temperature and
pressure).
dBZ- A unit of radar
reflectivity used in meteorology; the unit measures the amount of energy
returned to a weather radar site as a function of the amount transmitted (the
scale is logarithmic, a difference of 10 dB Z indicating a 10-fold increase in
energy returned) normalized for distance of echo from the radar.
Dyne-
The unit of force in the centimeter–gram–second system of physical
units, that is, one gm cms-2 , equal to 7.233 × 10-5 poundal".
