The density of an irregular object is the mass per unit volume. It is measured in kilograms per cubic meter (kg/m³). The density of an irregular object can be determined by using the following formula:

```

Density = Mass / Volume

```

To measure the mass of an irregular object, you can use a scale. To measure the volume of an irregular object, you can use a water displacement method.

Here are the steps for measuring the volume of an irregular object using the water displacement method:

1. Fill a graduated cylinder with water.

2. Place the irregular object in the graduated cylinder.

3. The water level will rise. Note the new water level.

4. Subtract the initial water level from the final water level to find the volume of the irregular object.

Once you have the mass and volume of the irregular object, you can calculate its density using the formula above.

For example, if an irregular object has a mass of 10 grams and a volume of 5 cubic centimeters, its density would be 2 grams per cubic centimeter (g/cm³).