The newton/meter is the SI-derived unit for surface tension. One newton per meter is the same as one newton per meter. The newton is a very large force, and it takes a lot of energy to create a newton's force. Thus, the newton is also called a "frictional" or "contact" unit.

In chemistry, the newton is used as a measure of reaction force. In physics, the newton is used to describe forces between objects, including gravity. A body that is able to apply a newton of force will be able to lift or pull **another object** that is equal in mass to itself.

When two objects with mass are pulled together, they experience an attractive force due to **quantum mechanics**. This is called the "van der Waals force" and has nothing to do with classical mechanics; it is a quantum effect. For atoms and molecules, the magnitude of **this force** is so small that it can only be measured experimentally.

Atomic masses are very close to the mass of a proton or a neutron, which are both types of particle called "leptons". Leptons are the most common type of particle in the universe. They account for **about 95%** of the matter in the cosmos.

These equations plus the seven SI base units provide the SI derived units for these derived values...

Derived quantity | Name | Symbol |
---|---|---|

speed, velocity | meter per second | m/s |

acceleration | meter per second squared | m/s2 |

wave number | reciprocal meter | m-1 |

mass density | kilogram per cubic meter | kg/m3 |

These equations plus the seven SI base units provide the SI derived units for these derived values... Fundamental and Derived Units

Derived Quantity | Name | Expression in terms of SI units |
---|---|---|

pressure | pascal | m-1·kg·s-2 |

energy, work | joule (J) N-m | m2·kg·s-2 |

electric potential | volt (V) | m2·kg·s-3·A-1 |

current density | ampere per square meter | A/m-2 |

See Definitions of the SI base units and their historical context for further information on the SI base units.

Derived quantity | Name | Symbol |
---|---|---|

speed, velocity | meter per second | m/s |

acceleration | meter per second squared | m/s2 |

wave number | reciprocal meter | m-1 |

mass density | kilogram per cubic meter | kg/m3 |

Table 3: Special Named SI Derived Units

Quantity | Name | Expression in terms of other units |
---|---|---|

force | newton | m·kg/s2 |

pressure, stress | pascal | N/m2 |

energy, work, quantity of heat | joule | N·m |

power, radiant flux | watt | J/s |

1000 newtons per meter or 0.033 kilopascals.

Exemplifications of derived quantities and units

Name | Symbol | Expression in terms of SI base units |
---|---|---|

joule per square metre | J/m2 | kg⋅s−2 |

kilogram square metre | kg⋅m2 | m2⋅kg |

newton metre second per kilogram | N⋅m⋅s/kg | m2⋅s−1 |

watt per steradian | W/sr | m2⋅kg⋅s−3 |

The SI Units system selects seven magnitudes to form a basic set (metre, kilogramme, second, ampere, kelvin, mole, and candela), and all others (e.g. hertz, newton, volt, radian) are regarded as deriving from **this set** by appropriate definitions involving only multiplication, division, differentiation...

In other words, every quantity can be expressed in terms of one or more elements of the basic set, and any number multiplied by an element of the basic set will again yield a valid expression for a quantity.

For example, we can express the velocity of light in vacuum as c = 299792458 m/s, which means that it is equal to the metre times some number less than one. We know that 1 metre equals **39.37 inches**, so c must be divided by 39.37 to obtain a value for m.

Thus the unit of velocity is metres per second, or m/s. All physical quantities can be expressed in terms of these seven units, which are defined to have **the following values**:

M = 0.000001 kg

S = 1000 m/s

A = 0.0011 eV/(GeV·cm)

K = 1.3806504 × 10^-23 J/K