Weights and measures [D]
Dactyl: Linear measure used by the ancient Greeks, which had approximately a finger phalanx, little more than 8 lines.
Date: Measurement of length, also Greek = 0.019 m.
Decade: measure of time, used by the Egyptians, who divided the month into decades = 10 days. It is also equal to 10 years. In ancient Greece, the set of 10 soldiers was called a decade.
Decastereo: Volume measure = 10 m³
Decempeda: Length measure of ancient Rome = 2,962 m.
Decade: conventional measure of time = 10 years.
Decibel: this unit is equivalent to a tenth of a bel or bel (unit of invincible sound.
Decibel: practical measure of comparison between two electrical powers or, also, between two acoustic powers = 0.1 bel. A pair of powers are one decibel apart when they are in the ratio 1:1.26.
The decibel is used as an absolute unit of power, referred to some level of arbitrary choice; the use has become widespread, mainly the following:
Telephony: level 0 = 1 milliwatt.
Radio circuit: level 0 = 6 milliwatts.
One decibel = 0.115 neper.
Finger: ancient measure of Roman origin = ¼ span = 0.111 m. In the past, it was = one of the 48 parts into which the Castilian vara is divided. Record other differences: = to the twelfth part of the span = 9 lines. In Spain = 0.0174 m; in Greece = 0.019 m, in Rome = 0.018 m.
Destre Mallorquín: Spanish measure of length = 4.214 m and surface area (in Mallorca) = 17.1578 m²
Ardura day: Spanish agrarian measure, typical of Asturias = 18,788 a.
Ox day: Spanish agrarian measure, typical of Asturias = 12.577269 a.
Digitus: Greek measure of length = 0.018 m (= width of 1 finger).
Dilochos (Dilodros): Ancient Greek itinerary measure = 12 stadia = 2.222383 km = which was later the Gallic mile in the Roman Empire.
Dyna: Equivalent to a force capable of printing an acceleration of one cm per second to the gram-mass = 1.01937 milligrams force = 10 -5 newton = 10 -8 stenium. In practice, its multiples are used, of which the most used are: The megadyne = 10 -6 dynes. The kilogram force = 981 10³ dynes and the newton = 10 5 dynes and its divisor, the millidyne = 0.001 dyne.
Drachma: ponderal = to the eighth part of an ounce = 3 scruples = 2 adarmes. Liquids = 60 drops. In Egypt = 0.0031 kg and in Austria = 4 pfening = 4.375 g.