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2. International Prototype of the Kilogram - Wikipedia

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

   For instance, K20, the US's primary standard, originally had an official mass of 1 kg − 39 μg (micrograms) in 1889; that is to say, K20 was 39 μg less than the IPK. A verification performed in 1948 showed a mass of 1 kg − 19 μg. The latest verification performed in 1989 shows a mass precisely identical to its original 1889 value.

3. Pound (mass) - Wikipedia

   en.wikipedia.org/wiki/Pound_(mass)

   The pound or pound-mass is a unit of mass used in both the British imperial and United States customary systems of measurement.Various definitions have been used; the most common today is the international avoirdupois pound, which is legally defined as exactly 0.453 592 37 kilograms, and which is divided into 16 avoirdupois ounces. [1]

4. Kilogram - Wikipedia

   en.wikipedia.org/wiki/Kilogram

   The kilogram (also spelled kilogramme [1]) is the base unit of mass in the International System of Units (SI), having the unit symbol kg. [1] ' Kilogram' means 'one thousand grams' [2] and is colloquially abbreviated to kilo.

5. Tesco - Wikipedia

   en.wikipedia.org/wiki/Tesco

   Tesco plc (/ ˈ t ɛ s. k oʊ /) is a British multinational groceries and general merchandise retailer headquartered in Welwyn Garden City, England. [8] The company was founded by Jack Cohen in Hackney, London, in 1919.

6. Alternative approaches to redefining the kilogram - Wikipedia

   en.wikipedia.org/wiki/Alternative_approaches_to...

   Achim Leistner at the Australian Centre for Precision Optics (ACPO) holds a 1 kg, single-crystal silicon sphere for the Avogadro project. Among the roundest man-made objects in the world, the sphere scaled to the size of Earth would have a high point of only 2.4 metres above "sea level".

7. SI derived unit - Wikipedia

   en.wikipedia.org/wiki/SI_derived_unit

   SI derived units are units of measurement derived from the seven SI base units specified by the International System of Units (SI). They can be expressed as a product (or ratio) of one or more of the base units, possibly scaled by an appropriate power of exponentiation (see: Buckingham π theorem).