The kilogram has the dubious distinction of being the only SI unit still based on a physical object; specifically, a metal cylinder kept in a vault in France. Plans are well underway to redefine the ...

A new definition of the kilogram is required, an international team of scientists contends. The current one is imprecise, they say, because it is not linked to an unvarying property of nature. The ...

Press, Volume, Temperature (PVT) Relationships: Knowing R allows us to calculate any of the four variables in an ideal gas system if other three things are known to us. It is important in various ...