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Body parts.
668 ppm stands for 668 parts per million. It is a unit of measurement used to describe the concentration of a substance in a solution or mixture. In this context, it means that there are 668 parts of a particular substance for every 1 million parts of the solution or mixture.
the metric system
An inch is not a measurement unit in the Metric system, and it can be divided into 16 parts, as well as other parts, such as 2, 4, 8. 32, 64, etc.
The cubit was the first documented record of a specified length, and was the length of an average forearm of a person. Joints of fingers gave "inch" its standard length, and the height of horses is still measured in "hands." Measurement of lengths and heights arose from body parts, as these were standard things that people carried around with them. No set "system" in particular exists for the use of these standards, but many standards we have today were derived from them.
Body parts.
A king's foot used to be the standard of measurement, now there is a Bureau of Measurements in the Washington DC that has standard measurement's that everyone else uses.
The Standard Method of Measurement is used for the measurement of construction works. It gives guidelines as to what should be measured for various parts of the construction process. It allows for estimators to measure works in a standard format for easy preparation of a Bill of Quantities nad easy comparisson of tenders.
1.It won't be accurate. 2.Everyone has different sized body parts. 3.It isn't a standard form of measurement.
Yards
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In olden times, measurement was done using the body parts.
Parts refers to a miscellaneous, fractional standard of measure. For example, 1 part bleach to 10 parts water. If you wanted to make a lot, you might use gallons: 1 gallon of bleach with 10 gallons of water. If you wanted to make a little: 1 tablespoon of bleach to 10 tablespoons of water. You pick the standard "part" size to get the quantity you need.
a number and a unit
Of course it has a length and width
parts per billion
It is not possible to answer the question without some information about the location. A bigha is not a standard unit of measurement and in some parts of the South Asia it can be as many as 2.7 bighas in an acre. In other parts, the bigha is almost 10 times as large and there are only 0.33 in an acre.