The history of measurement. In ancient times, our ancestors have not yet standardized tools about measuring distances. Time, space and volume, sometimes there is a problem of interpretation do not match. When there is contact between communities. With trading exchanges to have units of measurement, and tools used to measure precisely to convey more matches. For measuring length with a rough sequence evolution in early stage are used in different parts of the body as a reference criterion, such as 1 inch, 1 1/1 Sok., creep, but they still can't tell a clear, anyway, because of the progress just Grand, elbow, community that is used to measure the length does not equal. Subsequently, it has developed into an international standard measurement unit that is used.The British system, there is a length unit of measure inches, feet, yards, and miles, etc.Mobile metrics system in France When year length unit 2336 centimeters, meters, kilometers, etc. For the domestic Thai when 2466 (1923) declared using the Act of measurement using the metric system of measurement units. By the Act defined a specific unit of measure volume, area, length, and mass. Buy a purpose for it, particularly in such trading. 2 elbow equals 1 Wah 1 Rai equals 1600 square metres 1 THB is equal to 15 g. When the standard international organization 2503 (1960) (International Organization for Standardization, or ISO abbreviation) has been given to a new measurement system. In order to measure scientific and technology, is the same all over the world. Called the international system (System International d ' Unites) or also known as SI: M (Meter: m) is the unit used to measure the length. Kilogram (kg: Kilogramme) is the unit used to measure mass. Seconds (Second: s) is the unit used to measure time. Ampere, (Ampere: A) is the unit used to measure electric current. Kelvin (Kelvin: K) is a unit used to measure temperature. Ken de la (cd: Candela) is the unit used to measure the intensity of the lighting. MOL (Mole: mol) is the unit used to measure the quantity of the substance. In addition, there is a measure which is of international standard. The tools used to measure, it is very important as well. However, in daily life, we may not be the tools used to apply in all places. Every time. Need to estimate the length or quantity of curious things. Estimates of quantities, telling of things without actually measure called the prognosis.
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