What is the pressure, in Pa, if the height of a column of mercury is 400. mm and the density of mercury is 13.6 gcm3

Explanation:

Pressure due to a liquid column

P = hdg where h is height of column , d is density of liquid and g acceleration due to gravity .

( 13.6 g cm⁻³ = 13.6 x 10³ kg m⁻³ , because 1 m³ = 10⁶ cm³ )

Putting the given values in the equation

P = 400 x 10⁻³ x 13.6 x 10³ x 9.8 Pa

= 53312 Pa

answers: to make sure that all of the broken pieces of tablet were added to the water, to allow for fair comparison of all three trials, with different particle sizes to avoid experimental error