When external pressure decreases which occurs? 1) boiling point decreases 2) boiling point increases 3) temperature...

When external pressure decreases which occurs?

1) boiling point decreases

2) boiling point increases

3) temperature increases

4) liquid condense

5) none of these

Expert Solution

The boiling point of a liquid is defined as the temperature at which its vapor pressure is equal to the external pressure. If external pressure is 1 atm then the boiling point is known as the normal boiling point.

The boiling point of a liquid varies with external pressure. Increase in external pressure will increase the boiling point of a liquid and decrease in external pressure will decrease its boiling point.

So, when external pressure decreases boiling point of the liquid decreases because vapor pressure of the liquid decreases and it boils at lower temperature. With much less pressure, we don’t need to apply as much heat to push vapor pressure beyond the external atmospheric pressure that is, water boils at a lower temperature.

The following graph shows the boiling point for water as a function of the external pressure. The line on the graph shows the normal boiling point of water.

queen_honey_blossom answered 2 years ago

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