{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

# 02Post - SUSB-003 BACKGROUND Measuring devices have...

This preview shows pages 1–2. Sign up to view the full content.

1 Introduction to Laboratory Measurement SUSB-003 SUSB SUSB-003 003 Last Updated: 9/2/2009 Measuring devices have intrinsic uncertainty i.e., limitations due to their design/construction BACKGROUND Measurement process itself may introduce additional uncertainty Measurer usually plays a role in the measurement Uncertainty process In chemistry, certain quantities are often chosen as fundamental : m ass, t ime length (area, volume), Many measuring devices are constructed so as to be LINEAR RULE OF THUMB: On a LINEAR SCALE LINEAR SCALE , human eye is capable of estimating the location of a mark lying between two smallest divisions to the nearest 1/5 th of a division Linear/Rule What distinguishes scientific computation from arithmetic primarily is that most scientific numbers include units . PROCEDURE 1. Measure Diameter of Plastic Sphere 2. Weigh Plastic Sphere using two types of balance 3. Compute Density of Sphere using above two results & examine uncertainty 4. Direct Measurement of Liquid Volumes 5. Record weight of a penny Procedure 1. Measure DIAMETER, d From that, compute AREA and VOLUME of a SPHERE from the known mathematical relationships to the diameter. A = π d 2 V = π d 3 / 6 Purpose : To explore error propagation in quantities derived from diameter Cube I.e., suppose we make a small error in measuring d. How large an error will that produce in A and V ?

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

### What students are saying

• As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

Kiran Temple University Fox School of Business ‘17, Course Hero Intern

• I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

Dana University of Pennsylvania ‘17, Course Hero Intern

• The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

Jill Tulane University ‘16, Course Hero Intern