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The nanometre ( SI symbol: nm) is a unit of length in the metric system equal to 10−9 metres ( 1 1 000 000 000 m = 0.000 000 001 m ). To help compare different orders of magnitude, this section lists lengths between 10 −9 and 10 −8 m (1 nm and 10 nm). 1 nm – diameter of a carbon nanotube.
Ohm's law states that the electric current through a conductor between two points is directly proportional to the voltage across the two points. Introducing the constant of proportionality, the resistance, [ 1] one arrives at the three mathematical equations used to describe this relationship: [ 2] where I is the current through the conductor ...
5 π ≈ 3.4377′. A milliradian ( SI -symbol mrad, sometimes also abbreviated mil) is an SI derived unit for angular measurement which is defined as a thousandth of a radian (0.001 radian). Milliradians are used in adjustment of firearm sights by adjusting the angle of the sight compared to the barrel (up, down, left, or right).
Density ( volumetric mass density or specific mass) is a substance's mass per unit of volume. The symbol most often used for density is ρ (the lower case Greek letter rho ), although the Latin letter D can also be used. Mathematically, density is defined as mass divided by volume: [ 1] where ρ is the density, m is the mass, and V is the volume.
141.6 in oz. The newton-metre or newton-meter (also non-hyphenated, newton metre or newton meter; symbol N⋅m[ 1] or N m[ 1]) [ a] is the unit of torque (also called moment) in the International System of Units (SI). One newton-metre is equal to the torque resulting from a force of one newton applied perpendicularly to the end of a moment arm ...
If an isolated box of ideal mirrors could contain light, the individually massless photons would contribute to the total mass of the box by the amount equal to their energy divided by c 2. [7] For an observer in the rest frame, removing energy is the same as removing mass and the formula m = E / c 2 indicates how much mass is lost when energy ...
c = n/V. Dimension. L − 3 N {\displaystyle {\mathsf {L}}^ {-3} {\mathsf {N}}} Molar concentration (also called molarity, amount concentration or substance concentration) is a measure of the concentration of a chemical species, in particular, of a solute in a solution, in terms of amount of substance per unit volume of solution.
The United Nations Development Programme (UNDP) compiles the Human Development Index (HDI) of 193 nations in the annual Human Development Report.The index considers the health, education, income and living conditions in a given country to provide a measure of human development which is comparable between countries and over time.