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The 42 over 41 is an error coin. A die hub prepared for 1941 was re-cut for use in 1942. The original "1" shows behind the "2" in the date.
because that is far the degrees goes on earth. otherwise 200 degrees or over we all as humans will die or be dead. or the mercury themometer will explode.
Cohesive force between molecules of mercury is more than adhesive force between molecules of mercury and those of glass. This results in formation of a convex meniscus for surface of mercury. Actually, cohesive and adhesive forces are phenomenon due to surface tension of a liqud. The angle made by mercury from the glass surface is obtuse.
3.598 x 10^7 miles
4.8 x 10^7 miles