SACHIN NAVATHE
Mechanical
25 Aug 2015

# Why is capacity inversely proportional to volume?

I would like to know how capacity is inversly proportional to vacuum ? see the graph which is given below.
25 Aug 2015
N.SACHIN
I would like to know how capacity is inversly proportional to vacuum ? see the graph which is given below.
What does this graph represent? If it is about a pump, then for a given horse power, the graph is valid. The power consumed by a pump is directly related to the volumetric capacity/time x the vacuum level.

SACHIN NAVATHE

Mechanical
25 Aug 2015
Sir it is about vacuum pump.From the above graph i can say that,if capacity increases vacuum decreases i.e how vacuum is inversly proportional to capacity ?
26 Aug 2015
I am removing the earlier post as it was a bit confusing. Let me see if this is slightly better. For a vacuum pump the product of the volume of gas pumped in a given time and the pressure difference represents the power. This implies that a high capacity pump will have low pressure difference and vice versa. This the reason for the graph's shape.