Explain why large mercury drops form oral ball on a glass slide

large for large drops of mercury surface tension is not enough to keep the drops spherical because due to its weight, it flattens on surface of earth instead of being round shaped.

answer: 2×10^-2kg

explanation: density= mass per volume

vol=mass/density

converting to s.i units we have;

3÷1000kg = 0.003

1.5÷100m = 0.15

0.003/0.15 = 0.02kg