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What factors govern the accuracy of your density measurement? Hint: think about how you measure mass...

What factors govern the accuracy of your density measurement? Hint: think about

how you measure mass and volume. Which measurement is likely to determine the

number of significant figures used in your answer? Explain

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Answer #1

Density is mass per unit volume, so when measuring density, we find the mass of the object and divide it by its measured volume. All measurements include some uncertainty, however certain kinds of errors can increase the uncertainty in calculation further still. It is Always better to use the most accurate tools available to reduce errors when measuring density. while measuring Liquid Volume There are many different instruments you can use to measure liquid volume - measuring cups, beakers, graduated cylinders and volumetric pipettes are a few examples. Unfortunately, not all of these instruments offer the same level of precision and accuracy. Beakers and kitchen measuring cups are the least accurate of these devices. Graduated cylinders are somewhat more accurate, and volumetric pipettes are the most precise of these tools Regular Solid Volume If a solid has a regular shape like a cube or a cylinder, its volume is easy to calculate using simple geometrical formulas. still to measure its length, radius and so forth, however the ruler used to take measurements introduces a possible source of error, since our measurement will only be as accurate as your measuring device. Moreover, if the shape of the solid has some irregularities - a dent in the top of the cube -the calculation of its volume will be neglected by the amount of the irregularities Irregular Solid Volume If a solid is irregular in shape - a wood chip, for example we need to use calculus to calculate its volume, and the calculation becomes very difficult, depending on the shape of the object. It would be better off determining the volume by submerging the object in liquid an<d checking to see by how much the volume changes. we must choose a liquid in which the object sinks rather than floats, however, and it is also important to make sure the object does not soak up the liquid. If you were to use wood chips in water, for example, they would float and soak up some of the water, skewing your volume measurement. Mass The final possible source of error is the measurement of mass. Typically, mass is measured using a scale or balance. The accuracy of measurement will depend on the kind of scale used. A normal scale, for example, is probably less accurate than a calibrated scale. Generally, it is important to take these possible sources of errors into account when they make a measurement by reporting an uncertainty value. In other words, rather than reporting density as just x, they will report it as x +/-y. The greater the uncertainty, the greater y will be, so this uncertainty value gives you a sense for the reliability of the measurement.

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