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Navier-Stokes equations

The Navier-Stokes equations describe fluid flows and are among the fundamental equations of fluid ...

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Net positive suction head

In physical terms the concept of the German term "Haltedruckhöhe" (retaining pressure head) is the ...

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Neutral conductor

The neutral conductor is also referred to as the mid-point conductor in a single-phase alternating ...

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Newtonian liquid

As per DIN 1342, the Newtonian liquid is defined as an isotropic, purely viscous liquid (see ...

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Noise control

Noise control means precautions that are designed to reduce the level of noise in pumps and systems ...

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Noise in pumps and systems

The noise emitted by pumps and systems is caused by vibrations in the piping and the pump casing.

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Noise measurement

Noise measurement is conducted to define a noise emitted by a source (also see Noise in pumps and ...

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Nominal diameter

The nominal diameter is referred to as the pipe diameter or the mating dimension of a valve (with ...

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Nominal pressure

The term nominal pressure was changed to PN, as this term was only vaguely associated with ...

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Nominal speed

Nominal speed (nN) is a suitable, rounded speed value for classifying the speed range (see Nominal ...

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Nominal value

The nominal value as defined by DIN 40 40200 is a suitable rounded value of a quantity for ...

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Normally closed contact

The normally closed (NC) contact is also referred to as the break contact and is a contact that ...

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Normally open contact

The normally open contact is an electrical switching contact that closes when the actuating force is ...

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Nozzle

A nozzle is a tube-like technical device used to convert pressure into kinetic energy or to evenly ...

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NPS

NPS stands for Nominal Pipe Size and refers to the nominal diameter, which for threaded pipes is ...

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NPSH

The term NPSH is the abbreviation of "net positive suction head" and is an important factor in ...

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NTC resistor

The NTC (Negative Temperature Coefficient) resistor is also referred to as the NTC thermistor and is ...

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NTC thermistor

The negative temperature coefficient (NTC) thermistor is also referred to as the NTC resistor.

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Number of operating hours

The number of operating hours indicates how long a piece of equipment or electrical consumer has been ...

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Number of poles

number of poles_original

The number of pole pairs (p) or number of poles for an asynchronous motor determines the motor's ...

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Number of starts per hour

The number of starts per hour (Z) determines the maximum number of starts that should be performed by ...

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