The same goes for measuring volume. Obviously, you'll get a more precise measurement using a graduated cylinder than using a beaker, however, you may not need such a close measurement.
The significant figures reported in the density calculation are those of your least precise measurement. So, if your mass is 22 kg, reporting a volume measurement to the nearest microliter is unnecessary. Another important concept to keep in mind is whether your answer makes sense. If an object seems heavy for its size, it should have a high density value.
How high? Objects less dense than this float in water, while those that are more dense sink in water. If an object sinks in water, your density value better be greater than 1! Need more examples of help with related problems? Actively scan device characteristics for identification. Use precise geolocation data. Select personalised content. Create a personalised content profile. Measure ad performance.
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Facebook Facebook Twitter Twitter. A dense object weighs more than a less dense object that is the same size. An object less dense than water will float on it; one with greater density will sink. Mass and density — along with volume, the concept that links these two quantities, physically and mathematically — are two of the most fundamental concepts in physical science.
Despite this, and even though mass, density, volume and weight are each involved in countless millions of calculations worldwide every day, many people are easily confused by these quantities.
Numerous misconceptions abound about the relationship between density and weight. These are understandable and easily cleared up for most with a review such as this one. Many materials naturally consist of, or are manufactured from, a mixture or elements or structural molecules, each with their own density.
If you know the ratio of individual materials to each other in the item of interest, and can look up or otherwise figure out their individual densities, then you can determine the composite density of the material as a whole. The shape of an object with a given volume and mass has no affect on its density, even if this can affect the object's mechanical properties.
Similarly, two objects of the same shape and hence volume and mass always have the same density regardless of how that mass is distributed. In the days of ancient Greece, Archimedes rather ingeniously proved that when an object is submerged in water or any fluid , the force it experiences is equal to the mass of the water displaced times gravity i.
This leads to the mathematical expression. In words, this means that the difference between an object's measured mass and its apparent mass when submerged, divided by the density of the fluid, gives the volume of the submerged object.
This volume is easily discerned when the object is a regularly shaped object such as a sphere, but the equation comes in handy for calculating the volumes of oddly shaped objects. Remember, a meter is only about three and a quarter feet; water is perhaps "thicker" than you thought!
Most objects in the natural world have their mass unequally spread throughout whatever space they occupy. Your own body is an example; You can determine your mass with relative ease using an everyday scale, and if you had the right equipment you could determine your body's volume by submerging yourself in a tub of water and employing Archimedes' principle.
But you know that some parts are much more dense than others bone vs. How do you derive the formula of density of mixed liquids with the same mass? Asked 6 years ago. Active 5 years, 11 months ago.
Viewed 16k times. Improve this question. Gert I'm guessing that your equation is for either 1 adding two equal masses of different densities or 2 adding two equal volumes of different densities. Do you know which it is? Didn't look at the title Show 1 more comment.
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