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IT Grade refers to the International Tolerance Grade of an industrial process defined in ISO 286. This grade identifies what ... more

A spring is an elastic object used to store mechanical energy. Springs are usually made out of spring steel. Small springs can be wound from pre-hardened ... more

The Froessling equation is a specific correlation of the Sherwood number (Sh) for a single sphere analysis.

In chemical kinetics, the pre-exponential factor or A factor is the pre-exponential constant in the Arrhenius equation. Here named as Arrhenius number.

An approximate formula given by Balje for radial-tipped (β2=900) blade impellers

The current gain can be calculated using current instead of power using Joule’s first law to calculate. In many cases, the input and output ... more

The power gain can be calculated using voltage instead of power using Joule’s first law to calculate a voltage gain. In many cases, the input and ... more

For periodic compounding, the exact doubling time for an interest rate of r per period is a logarithmic formula, that can be used if we want to know the ... more

The refractive index is used for optics in Fresnel equations and Snell’s law; while the relative permittivity and permeability are used in ... more

In fluid dynamics the Borda–Carnot equation is an empirical description of the mechanical energy losses of the fluid due to a (sudden) flow expansion. The ... more