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Experiment on Accuracy of Measurement

Everything around you can be measured example- the food you eat, say you want to cook 1 kg of rice. Kg is a unit of measurement. The distance between two planets too can be measured, even the width of a bacteria can be measured. See how important measurement is. This experiment is about how to measure objects accurately using a ruler as well as how to measure the temperature of an object accurately.

Name________________________

Course & Section ______________

Instructor_____________________

RATING: ________

Experiment on Accuracy of Measurements (Length and Temperature)

Theory:

The units commonly used for expressing linear dimensions are centimeters (cm), meter (m), and millimeters (mm). For convenience, a 12-cm ruler is used not only for laboratory work but also for other purposes. For experiments involving changes in temperature, the mercury level in a chemical thermometer is not forced down. Chemical thermometers are made of glass and such, great care is necessary in handling them. Accuracy of thermometers depends on the uniformity of the bore in the tubing that contains the mercury and the care in determining the reference points.

                

Objectives:

a) Design appropriate means to do accurate precise measurement in the future in relation to future seafaring life.

b) To gain skill in measurements of length and temperature.

APPARATUS/MATERIALS:

Ruler, meter stick, string, ball, marble, cylinder metal, caliper, test tube, thermometer, Erlenmeyer Flask, cold water

PROCEDURE:

1. Measure the length of the laboratory table or blackboard with a meter stick, both on the metric and English system scales. For accurate results, always align the division of the meter stick with the edge of the table. Do the same with the test tube. Enter your data on the table provided by your instructor.

2. Measure the diameter and circumference of three objects-a ball, cylinder metal, and marble. To measure the circumference of a circular object, wind enough string to go around the circle once. Then unwind the string, and measure it with a ruler. Enter your data on the table provided by your instructor.

3. Divide the circumference by the diameter of each circle. The quotient is pi. Compute the % of Error by getting the difference between the experimental value and the true value (3.1415927) and dividing it by the true value times 100%.

4. Measure the temperatures of cold water in an Erlenmeyer flask. Take three readings using a thermometer as the temperature goes down. Convert the reading in Celsius scale, into Fahrenheit scale and Kelvin scale. Record your data on the table provided by your instructor.

PROBLEMS AND APPLICATIONS:

1. How do you obtain an accurate results on the measurement of length?

2. What is the advantage of the Metric System over the English System of units?

3. Do you consider your measurement accurate (on the basis of your results)? If not, why?

4. What liquid is advisable to use inside the thermometer? Mercury or alcohol? Why?

5. A nautical student is 5 feet and 6 & 1/2 inches tall. What is this height in cm?

Ans: ____________

6. A projectile is fired by an engineering student at a speed 0f 2,500 ft/sec. What is the speed in Km/hr.

Ans:____________

Prepared by: Jessie R. Agudo, Master of Arts in Teaching Mathematics/B.S. Civil Engg'

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