How to measure the volume of something too big for a jar

You will construct an tank (aquarium), the more indicated is glass because you need very straight wall with 90 grades in the walls and in the encounters, but if the object is very big you will construct a swimming-pool, and you will put the object in the empty tank and start to fill counting the volume that you put, like this you will fill with a jar of one liter,(the swimming-pool could you count with ‘vazão’(flow) after you at least cover the object don’t will change the final result if you fill more or less have to at least cover the object, now you will, make the calculation of the volume of the tank, you don’t count the walls they could be thick and that will influence in the result making it wrong, so you measure only the inside, so you multiply the base that is width and extension (that will never change for the tank that you construct, like this you construct a 90 for 70cm in base tank the height is the enough to cover the objects that you will measure) and you will measure the height of the water and not the height of the tank and the result will be in cm³ or m³, if you used cm to calculate you will have cm x cm x cm, so you will have cm³, and you will subtract the multiplication of the volume that you put in the tank, if necessary make conversion of quantities, the volumes had to be in the same quantity to do the subtraction, so all had to be in liters or in cm³for instance, and you will have the volume of the object. Rute Bezerra de Menezes Gondim