The nuclear Regulatory Commission's science 101: What is Matter?
You are watching: The quantity of matter in an object
Let's say the we have a box with the adhering to dimensions: length = 3 meters ("m"), elevation = 4m, and also width = 5m. Based upon those dimensions, our box would have actually a volume that 60m3 (3m x 4m x 5m = 60m3). That is, again, a measure up (in cubic meters) of just how much three-dimensional room our crate takes up.
If, on the other hand, our object was a liquid, we could use a i graduated cylinder (a scientific measuring cup) to measure up the volume of our object. This measure would be reported in liters. Again, a liter is just a measure up of how much space a fluid takes up. For example, you have the right to purchase soda in 2-liter bottles.
Since we've been talk a tiny about measurements, it could make feeling at this point to distinguish between quantity and units. Thinking again around our example, the quantity we room trying to measure is volume. The unit we use to report this measurement is in liters or cubic meters.
Weight, top top the various other hand, is a measure of just how much gravitational pressure is exerted on an object. If the weight of things is proportional to its mass (the much more mass of an object the an ext it will certainly weigh), heaviness varies follow by where you are in the cosmos or even where you space on Earth—you actually sweet more, due to the fact that there is a greater gravitational force, ~ above the poles 보다 you would at the equator. So, while an item will have a specific weight here on Earth, it will certainly not have actually the exact same weight on the moon. That would, however, have actually the very same mass both places.
Now the we have the right to determine if something is matter (if it has volume and mass), we can use another measurement, density, to identify what kind of matter a problem is. Thickness is the ratio of how much fixed is in an item compared come the volume of that object. Density is calculate by dividing an object's massive by that is volume.
Think ago to our box v a volume of 60m3. Let's say the our box has a fixed of 240 grams (g). If that were the case, the thickness of our box would be 4 g/m3 (240g / 60m3). Density is nothing more than a way of stating exactly how much issue fits within a specific volume. Using the 2 pieces of candy, when both have the very same size (or volume), the heavy one has much more mass when compared to the hollow one and, as such, the solid candy is much more dense (more issue in a certain volume) than the hollow candy.
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Because the density of a specific substance (something through a characterized composition, such as pure copper), is the exact same for all piece of the substance, regardless of size, density is often valuable in identify the identity of a details object. As soon as we've calculated the density of one object, we have the right to compare that worth to the known densities for substances to recognize what problem we believe the object is.