Acertain person had a brain that weighed 1.45 kg and contained 6.41 × 1010 cells. assuming that each cell was completely filled with water (density = 1.00 g/ml), calculate the length of one side of such a cell if it were a cube.

Weight of 6.41×1010 number of cells is 1.45 Kg i.e, 1.45× gm. So, Weight of 1 (one) number of cells is= gm = 0.2239 gm.

Assuming that each cell was completely filled with water, from density, Volume of 1 gm water is 1 ml, so volume of 0.2239 gm water is 0.2239 ml. That means, volume of each cell is 0.2239 ml= 0.2239× m³. If each cell is considered as cube, volume of cube=(length of each side of cube)³= 0.2239× m³.

So, length of each side of cube= ∛(0.2239×= 6.07× meter.

in 1783 cavendish was working with his hydrogen gas and found that when he burned it and condensed the vapor it was water. this was very significant since it disproved the greek theory of elements completely since water was not a simple substance but the product of two gases. it was lavoisier who hearing of the experiment gave cavendish's gas the name hydrogen ("water-producer") and added that hydrogen burned by combining with oxygen and that water was a hydrogen-oxygen combination.

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