You would first need to think about the shape of the object. If the object is a line, the answer is easy: use a ruler. If the object is a curve, that is much harder. In general you need calculus, though there are some useful formulas. For example, the length of the circumfrance of a circle is pi times the diameter.
For a plane figure or a solid, the question becomes, what do you mean by length. For example, in a rectangle, if you call one side the length, you can call the other side the width, but it doesn't matter which you choose to call the length.
Funny story. I was selling a house, and the realtor came in to measure the length of our living room. He had a neat little gadget that bounced a light off a wall and measured the distance to the wall. But to do it correctly, he should have used his tool to bounce the light off the shortest distance to the wall. He bounced the light off at a diagonal distance, so he thought the length of our living room was much greater than it really was. I pointed out his mistake. He didn't appreciate it. I got another realtor.
By unit of length and distance and conversion ,we can say that physical property length is used to measure in centimeters.
a ruler
You would use a ruler or measuring tape to measure the length of an object. Place the edge of the ruler or tape at one end of the object and note the measurement where the object ends. Make sure to read the measurement carefully to get an accurate length.
that would depend on the size of the object. for eg the length of the golden gate bridge and the length of a knife would take 2 completely different units.
That depends what property you want to measure: its length, its weight, its mass, its density, its color, etc.
You could use a ruler or a measuring tape to measure the length of an object. Both tools have markings that allow you to accurately determine the distance from one point to another.
A scientist would most likely use a ruler or caliper to measure the length of a nail or other small object. These tools provide accurate measurements in centimeters or inches.
To measure a foot length you could use a ruler, a yard stick, a tape measure, or any object that you knew was precisely one foot long on a side or edge.
Length is a physical quantity that measures the extent of something along a straight line. Common units used to measure length include meters, centimeters, inches, and feet. Length is commonly used to describe the size and distance of objects.
mm is a measure of length, liters are a measure of volume, the two can not be equated.
Measure the three dimensions ( length, width and height) and multiply them together
It's the length around a round object, like if you would run a tape measure around barrel or a ball.