Shafts & the members of trusses....
You could measure the length or width of it but you would have a decimal. You should be using centimeters.
Not normally because meters would be more appropriate
tea in a cup
Ex. the distance between two cities A kilometer is 1,000 meters
You could align the edge of the object with the zero on the ruler and then read off the marking on the ruler which aligned with the other end of the object.
You could measure the length or width of it but you would have a decimal. You should be using centimeters.
by using a photometer
Not normally because meters would be more appropriate
To determine the density of a regular object, you would first measure its mass using a scale. Next, measure the object's volume using a ruler or water displacement method. Finally, divide the mass by the volume to calculate the density of the object.
tea in a cup
Ex. the distance between two cities A kilometer is 1,000 meters
Kilometers
To find the density of an irregular object, you would first measure its mass using a scale. Next, you would find the volume of the object using displacement method or by calculating it with water displacement. Divide the mass by the volume to calculate the density of the irregular object.
Distance
To identify an object using density, you would need to measure its mass using a balance and its volume using displacement or geometric methods. Then, calculate the density of the object by dividing the mass by the volume. Compare the calculated density to known densities of materials to determine the identity of the object.
You can measure any object you like using tonnes, however, unless the object is a massive one like an Elephant or a Bus, there is likely to be lots of zeros after (or before) a decimal point which would make it not a very sensible unit to measure the mass of the object.
kilometers