Metric is used in most countries in the world it is only USA and UK that is still using imperial. So the answer is the metre (or in USA, meter)
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The metric system is most widely used, used in every country with the exception of America and Belize.
1 newton= gram ? 1 newton=kilogram?
SAE is an acronym for the "Society of Automotive Engineers" and when used in conjunction with tool grade or measurement (not oil), is a standardized unit of non-metric measurement. Simply put, in measurements it means "Non-Metric". The name "SAE" used to grade motor oil has a totally different meaning, although instituted by the same society.
It is used to measure the rate of flow of liquid & glasses
A pound (Lb) is a unit of measurement for weight while a yard is a unit of measurement for distance. I think you have your question mixed up! If you need to make any conversions, I suggest the following site http://www.onlineconversion.com/ If you are refering to common measurements used on a construction site, a "yard" is a common abbreviation for a "cubic yard", which is a unit of measurement of volume. (A cubic yard equals 27 cubic feet.) In common usage, you may be asking what does a "cubic yard" of something like dirt or concrete weigh? Since dirt weighs about 110 pounds per cubic feet, a cubic yard of dirt weighs about 2970 Lbs. Since concrete is heavier (150 pcf), a cubic yard of concrete weighs about 4050 Lbs.