What is the difference between a mercurial barometer and an aneroid barometer?

mercurial barometer: A barometer in which the weight of a column of mercury in a glass tube with a sealed top is balanced against that of the atmosphere pressing on an exposed cistern of mercury at the base of the mercury column, the height of the column varying with atmospheric pressure.

                                                           v.s.

aneroid barometer: a device for measuring atmospheric pressure, often specially calibrated for use as an altimeter, consisting of a box or chamber partially exhausted of air, having an elastic top and a pointer to indicate the degree of compression of the top caused by the external air.

Explanation:

I used my idol's powers. PLUS ULTRA!!!

multiply it by 5 in order for you to understand i cant give an exact answer.