If the object is small enough to place into a graduated container, note the level of the water and then totally immerse the object (being careful that no air bubbles remain under it) by pushing it just below the surface. Note the difference in the water level, and calculate the volume by multiplying the difference in water level times the area of the graduated container.
Half fill a graduated glass beaker with water and note the level. Place irregularly shaped object into the beaker. Note the new level. The difference between the two levels is the volume of the object. cw: OK, that method works for objects that don't get wet -- like steel. Tissue paper would not be a good candidate. Also, if the object floats, you have to submerge the object.
Mass divided by Volume = Density. Or use the displacement method for an irregularly shaped object.
It is the displacement method.
If possible, fully immerse the object in water, and measure the volume of displaced water.
Google "Archimedes' Principle" and see if that gives you a clue...
You can push it under water / under the liquid's surface, and measure the displacement of liquid.
It is used to find the volume of an irregularly shaped object. An object dropped into a volume of water will displace an equal volume of water.
Half fill a graduated glass beaker with water and note the level. Place irregularly shaped object into the beaker. Note the new level. The difference between the two levels is the volume of the object. cw: OK, that method works for objects that don't get wet -- like steel. Tissue paper would not be a good candidate. Also, if the object floats, you have to submerge the object.
Use volume displacement method.
If the object in question is water proof, and small enough. You can measure the amount of displaced water when it is placed in a tank full of water, this may not work for a lot of things but it can help when attempting to measure some objects.
the water displacement method
When you are trying to find the volume of an irregularly shaped object.
Volume displacement.
Take an amount of water of which you know the volume. Drop the object in the water. Find the difference
The volume of the object is 7ml.
Using a graduated beaker, add water sufficent to totally immerse the object. Note the initial volume of the water without the object. Put the irregularly-shaped object in the beaker and note the final volume. The difference between the final and initial readings is the volume of the object. This is only possible if the object is not soluble in water. If it is, use some other fluid in which it is not soluble.
Mass divided by Volume = Density. Or use the displacement method for an irregularly shaped object.