3:21 PM ooo cricket 38% D texsu.blackboard.com Measurement of Density PURPOSE Us

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3:21 PM ooo cricket 38% D texsu.blackboard.com Measurement of Density PURPOSE Use a vermier caliper to measure Measure the mass and length of three different objects Calculate the density of a solid and compare with the accepted values of the density (standard Equipment list: Vemier caliper, balance, samples. Theory: Density is defined as the mass of the object M divided by the volume Vofthe object Density MV For a cube the volume is given by: V-L where L is the length of the cube. The quantities M, and Lare measured using a scale and a vernier caliper Then the volume of the object is calculated using equation 2 The values of both volume and mass of the object are used in equation calculate the density of the material. This density value will be then compared with the standard density value and a discussion about accuracy and precision of the experiment measurements will be performed. Vernier caliper: vemier caliper has on one side jaws you can place around an object, and on the other side jaus made to fit inside an object. These secondary jaws are for measuring the inside diameter of an Also, a stiffbar exends from the caliper as you open it that can be used to measure depth. The basic steps on using the vernier are as follows: Before measuringu do make sure the caliper reads 0when fully closed. If the reading is not 0, adjust the caliper's dial until you get a reading. 2. Close the jaws lightly on the item which you want to If you are measuring something round. be sure the axis of the part is perpendicular to the caliper. Namely, make sure you are measuring the full How to read the measured value: .Read the fixed scale first fixed scale laoks like a ruler, read it like you read a ruler in cm and mm. If

Explanation / Answer

1) Mass describes the accuracy of density measurement. So compare the measured value of M with the actual value for each material. Whichever's value is nearer, has more accurate determination.

2) The measurements of M and L are precise since all the values are more or less nearly the same. As for the accuracy, you need to check the actual value. If the readings are close to the actual value then the measurements are accurate, otherwise they are not.

3) Check the average value of M and L for accuracy. Whichever is less accurate contributed more to the error in the density.

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