You cannot measure its length, width and height and multiply these together because all bricks have holes or indentations where the cement goes to anchor one brick to another. This method will give you the volume of the brick and its holes - not the volume of the brick.
The simplest way is to place a large container in a tray. Fill a large container to its rim with water. Gently put a brick in the large container and collect the overflow. Carefully transfer the overfow into a measuring container. The volume of the overflow is the volume of the brick.
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You can use displacement of water to determine the volume of any object. This is according to Archimedes Principle. You place the brick (or any object) in a beaker of water, and measure how much water is displaced. This will equal the volume of the brick/object.
You should clarify whether you want to measure its length, surface area, volume,
mass, color, conductivity, density, reflectivity, weight, or whatever.
If the brick has the shape of a rectangular block, you can multiply length x width x height.
Density is defined as mass divided by volume, therefore: 100g/25cm3 = 4 g/cm3
The density of the brick is calculated by dividing its mass by its volume. In this case, the density of the brick is 150g / 50cm3 = 3 g/cm3.
Divide the mass by the volume and you get density. the answer would be 8.98.
Its volume.
To find the density of an object, you need to measure its mass and volume. Then, divide the mass by the volume to calculate the density. The formula for density is density = mass/volume.