# Measuring the mass of a wall

Suppose I am given a task to weigh this wall. Neither can I uproot this wall to put it on a weighing scale and measure its weight nor I can place a weighing machine below it.

What should I do then?

You can measure the volume $V$ and density $\rho$ of the wall and calculate the mass $m$ from this using this formula:
$$m = \rho \cdot V$$