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How to measure density of irregular solids

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Introduction

Measuring the density of irregular solids Research Density is a measurement of how compact a solid is. To measure density there is a standard formula, which is density=mass/volume. The S.I. units for mass are grams and volume is cubic centimeters hence density be g/cm3. To obtain the volume of a solid it can be measured from displacement or measurements of the dimensions. In this case it will be the displacement. Apparatus * Beaker * Eureka can * Distilled water * Object of measurement * Scale Method 1. Weigh and record mass of solid 2. Weigh the mass of the beaker on the scale (if the scale is fluctuating wait until it stops) and record it 3. Place the beaker underneath of the spout of the Eureka can 4. ...read more.

Middle

Weigh the beaker (and water) and wait until there is one reading and record it Results Mass of Beaker Mass of Beaker & Water Mass of object Metal weight 45.78 61.51 100.1 Corkscrew 45.88 57.14 8.66 Calculation Metal weight To get volume of water displaced: Mass of beaker & water -Mass of beaker = water displaced 61.51 - 45.78 = 15.73 To get density: Mass of object/Water displaced 100.1/15.73 = 6.36g/cm Corkscrew To get volume of water displaced: Mass of beaker & water -Mass of beaker = water displaced 57.14 - 45.88 = 11.26 To get density: Mass of object/Water displaced 8.66/11.26 = 0.77g/cm Experimental value Metal- 6.35g/cm Corkscrew- 0.77g/cm Logged Value Metal- 6.36g/cm Corkscrew- 0.8g/cm To work out the percentage error: (Experimental Value-Logged Value)/Logged Value x 100 Metal: (6.35-6.36)/6.36 x 100 = 0.1% Corkscrew: (0.77-0.8)/0.8 x 100 = ...read more.

Conclusion

Also not drying the beaker second time (when measuring second object) there was more drops of water weighing slightly more than the accurate beaker weight, even though this problem was minimal this still affected the results slightly. Another problem which occurred was that the object kept moving around in the water so it made the water fluctuate which caused over spilling the water into the beaker, but the object was slowly sunk to the bottom the second time to avoid the problem but then the string was dipped in as well (although it had little affect). Some of the inaccuracy can be due to the fact that the instruments we were given were limited, such as the scale only displayed up to two decimal spaces which were rounded off giving an inaccurate measurement. ...read more.

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