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  2. Demore Barnes - Wikipedia

    en.wikipedia.org/wiki/Demore_Barnes

    Demore Barnes (born February 26, 1976) is a Canadian actor. Barnes is best known for his roles as Sergeant First Class Hector Williams in the CBS military action television series The Unit, the archangel Raphael in Supernatural and Deputy Chief Christian Garland in Law & Order: Special Victims Unit.

  3. SI base unit - Wikipedia

    en.wikipedia.org/wiki/SI_base_unit

    "The kilogram, symbol kg, is the SI unit of mass. It is defined by taking the fixed numerical value of the Planck constant h to be 6.626 070 15 × 10 −34 when expressed in the unit J s, which is equal to kg m 2 s −1, where the metre and the second are defined in terms of c and ∆ν Cs." [1] The mass of one litre of water at the temperature ...

  4. Historical definitions of the SI base units - Wikipedia

    en.wikipedia.org/wiki/Historical_definitions_of...

    Mass, strictly the inertial mass, represents a quantity of matter. It relates the acceleration of a body to the applied force via Newton's law, F = m × a: force equals mass times acceleration. A force of 1 N (newton) applied to a mass of 1 kg will accelerate it at 1 m/s 2. This is true whether the object is floating in space or in a gravity ...

  5. List of The Unit characters - Wikipedia

    en.wikipedia.org/wiki/List_of_The_Unit_characters

    In Season 3, Hector met a woman named Annie at a local bar. She was a waitress and former US Army medic who happened to know Tiffany. They went on a date and then shortly thereafter (with some encouragement from the other Unit women) met up at a local motel in a nearby town. While there, Hector discovered Tiffy and Colonel Ryan having an affair.

  6. Planck units - Wikipedia

    en.wikipedia.org/wiki/Planck_units

    When this is applied to electromagnetic constants, ε 0, this unit system is called "rationalized ". When applied additionally to gravitation and Planck units, these are called rationalized Planck units [57] and are seen in high-energy physics. [58] The rationalized Planck units are defined so that c = 4πG = ħ = ε 0 = k B = 1.

  7. International Prototype of the Kilogram - Wikipedia

    en.wikipedia.org/wiki/International_prototype_of...

    The International Prototype of the Kilogram (referred to by metrologists as the IPK or Le Grand K; sometimes called the ur-kilogram, [1] [2] or urkilogram, [3] particularly by German-language authors writing in English [3] [4]:30 [5]: 64 ) is an object whose mass was used to define the kilogram from 1889, when it replaced the Kilogramme des ...

  8. Atom - Wikipedia

    en.wikipedia.org/wiki/Atom

    An example of use of a mass number is "carbon-12," which has 12 nucleons (six protons and six neutrons). The actual mass of an atom at rest is often expressed in daltons (Da), also called the unified atomic mass unit (u). This unit is defined as a twelfth of the mass of a free neutral atom of carbon-12, which is approximately 1.66 × 10 −27 ...

  9. 2019 revision of the SI - Wikipedia

    en.wikipedia.org/wiki/2019_revision_of_the_SI

    The SI system after the 2019 definition: Base units as defined in terms of physical constants and other base units. Here, means is used in the definition of . The SI system after 1983, but before the 2019 redefinition: Base unit definitions in terms of other base units (for example, the metre is defined as the distance travelled by light in a specific fraction of a second), with the constants ...