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According to the current understanding of physics, there is no such thing as "absolute motion". There is nothing in space that distinguishes one frame of reference from another. There is no "preferred" reference frame. Thus, if you don't specify a frame of reference, you don't know how an object is moving. Unless, of course, the frame of reference is implicit; in some practical situations it is.
a chemical change proude a different kind of matter
iddin is a different kind of omegle
Specific gravity, usually referred to as relative density is the ratio of the mass of a given volume of a substance to the density of a different reference substance. Water is often used as the reference.
This depends on the style of research paper one is writing. There are different processes for argumentative and analytical papers. Whichever kind is being written, it is important that the bibliography, or reference, section follows a set pattern.