Good sense at sea, where there are no mile markers but latitude can be measured.īecause the Earth is not a perfect sphere, it is not easy to measure the This may seem odd to landlubbers, but it makes Mile is defined to be the average distance on the Earth's surface representedīy one minute of latitude. Or NM) a unit of distance used primarily at sea and in aviation. One nat equals log 2 e = 1.442 695 shannons or log 10 e = 0.434 294 hartleys. Then the information content of the message is -log e p nats.įor example, if a message is a string of 5 letters or numerals, with all combinationsīeing equally likely, then a particular message has probability 1/36 5Īnd the information content of a message is 5(log e 36) = 17.9176 If the probability of receiving a particular message is p, The natural logarithm (to the base e) instead of the logarithm to theīase 2. The nat is similar to the shannon but uses nat or natural unit a unit of information content used in information and communications theory. In geology to measure small changes in the Earth's magnetic field. nanotesla (nT) a unit of magnetic field strength equal to 10 -9 tesla Strains in geological formations are often measured in this unit. Nanostrain is the strain producing a deformation of one part per billion (10 -9). Of this deformation relative to the same object in an undeformed state.
An object under strain is typicallyĭeformed (extended or compressed), and the strain is measured by the amount nanostrain (nstrain) an engineering unit measuring strain. nanosievert (nSv) a unit of radiation dose equal to 10 -9 sievert nanosecond (ns) a unit of time equal to 10 -9 second. Such tiny anglesĪre encountered in astronomy and in geological measurements. The nanoradian equals about 0.208 533 milliarcsecond (mas). nanoradian (nrad) a unit of angle measure equal to 10 -9 radian. Solar radiation and the tiny forces exerted within living cells. nanonewton (nN) a metric unit of force equal to 10 -9 newton (see below) or 0.1 nanon an informal name for the nanometer. This unit is common in biochemistry, since a mole of a large organic moleculeĬan be quite a large amount. nanomole a unit of amount of substance equal to 10 -9 mole. One nanometer equalsĠ.001 micrometer or 10 angstroms. Introduced inġ951, the nanometer replaced the millimicron. nanometer (nm) a metric unit of distance equal to 10 -9 meter. nanoliter (nl or nL) a metric unit of volume equal to 10 -9 liter or 0.001 cubic millimeter. This unit often occurs in the study of inhalation exposures. nanogray (nGy) a unit of radiation dose equal to 10 -9 gray or 0.1 micro rad nanogram (ng) a metric unit of mass equal to 10 -9 gram, or one millionth ofĪ milligram. This unit was previously called the millimicrofarad (m♟). nanofarad (nF) a common metric unit of electric capacitance equal to 10 -9 farad. Radioactivity of 37 atomic disintegrations per second. nanocurie (nCi) a common unit of radioactivity. Is frequently used in meteorology to express the partial pressure of atmospheric nanobar (nb or nbar) a CGS unit of pressure equal to 10 -9īar or 0.1 milli pascal (mPa). nanoacre a humorous unit of area on a computer chip, equal to one billionth of anĪcre or about 4.047 square millimeters. The prefix comesįrom the Greek word nanos, dwarf. nano- (n-) a metric prefix meaning 10 -9, or one billionth. The nail is equivalent to 1/16 yard,ġ/4 span, 2.25 inches, or exactly 5.715 centimeters. The length of the last two joints (including the fingernail) of the middleįinger. Like the ell, the nail was used for measuring cloth traditionally, it represented nail an old English unit of length equal to 1/20 ell. One that is, an index of refraction n is equivalent to ( n -ġ) x 10 6 N units. Of the index in N units is the number of millionths by which the index exceeds Of refraction of the atmosphere is only slightly greater than 1.
Symbols, abbreviations, or full names for units of length,Īrea, mass, pressure, and other types.Units: N N N a unit of refractive index sometimes used in atmospheric science. You can find metric conversion tables for SI units, as wellĪs English units, currency, and other data. It was first used around 1904, but not until 1948 was it officially adopted by the General Conference on Weights and Measures (CGPM) as the name for the mks unit of force.Ĭonversion calculator for all types of measurement units. In physics, the newton (symbol: N) is the SI unit of force, named after Sir Isaac Newton in recognition of his work on classical mechanics. The definition of a newton is as follows: The SI prefix "milli" represents a factor of Newton to mN, or enter any two units below: Enter two units to convert From: You can do the reverse unit conversion from