Here's why:
* Scale: A scale uses a spring or a load cell to measure the force exerted by the brick's weight. This force is directly proportional to the mass, so the scale displays the brick's mass.
* Balance: A balance compares the weight of the brick to a known standard mass. This is done by placing the brick on one side of the balance and the standard mass on the other side. The balance will indicate the brick's mass based on how the two sides compare.
While technically a scale measures weight (force due to gravity), it's often used to infer mass since the gravitational force is constant at a specific location.
