mikhail vasilyevich lomonosov first demonstrated and came up with the conservation of mass.
who first demonstrated and came up with the conservation of mass?
mikhail vasilyevich lomonosov
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the concept of carbon-arc lighting was first demonstrated by humphry davy in the early 19th century, but sources disagree about the year he first demonstrated it; 1802, 1805, 1807 and 1809 are all mentioned. davy used charcoal sticks and a two-thousand-cell battery to create an arc across a gap. he mounted his electrodes horizontally and noted that, because of the strong convection flow of air, the arc formed the shape of an arch. he coined the term "arch lamp", which was contracted to "arc lamp" when the devices came into common usage.
arc lamp