Pure substances are in appearance

The Pure substances are Homogenous in appearance

A pure substance ( a homogenous mixture ) appears in uniformity. i.e. all sides of a pure substance regardless of the size of the substance will appear in the same color or texture when observed. some examples of pure substances are ; pure water and steel.     while

An Impure substance is a non-homogenous mixture whereby some parts of the substances will appear in different colors or texture when put under observation.

Hence we can conclude that pure substances are Homogenous in appearance.

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most historians agree that gabriel mouton, the vicar of st. paul’s church in lyons, france, is the “founding father” of the metric system. he proposed a decimal system of measurement in 1670. mouton based it on the length of one minute of arc of a great circle of the earth (now called a nautical mile, 1852 meters). he also proposed the swing-length of a pendulum with a frequency of one beat per second as the unit of length (about 25 cm). a pendulum beating with this length would have been fairly easy to produce, thus facilitating the widespread distribution of uniform standards. over the years, his work was revised, improved, and extended by a number of french scientists.

the political sponsor of weights and measures reform in the french revolutionary national assembly was the bishop of autun, better known as talleyrand. under his auspices, the french academy appointed several committees to carry out the work of developing a usable system of weights and measures for france. one of the committees recommended a decimalized measurement system based upon a length equal to one ten-millionth of the length of a quadrant of the earth’s meridian (i.e., one ten-millionth of the distance between the equator and the north pole).

it is a solid

explanation: