How do you measure mass of regular and irregular objects?

To measure the mass of regular objects, you can use a balance scale, placing the object on one side and comparing it to known weights on the other. For irregular objects, you can use the water displacement method: submerge the object in a graduated container filled with water and measure the volume of water displaced, which is equal to the object's volume. Then, multiply the volume by the object's density (if known) to find its mass. Alternatively, simply use a scale to weigh the object directly, regardless of its shape.