Which would be most helpful to find the normal melting point and normal boiling point on a phase diagram? Draw a horizontal line across the triple point.

Locate the region that describes the liquid phase, then trace its border.

Draw a vertical line through the triple point.

Draw a horizontal line at standard pressure (1 atmosphere, or 101.3 kPa).​

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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im not exactly sure but i think its b!

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