{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

Lecture_02_010612

# Lecture_02_010612 - Lecture 2 Scientific Communication...

This preview shows pages 1–9. Sign up to view the full content.

Lecture 2: Scientific Communication • Outline (Zumdahl Ch. 1 & Appendix 1 & 2) : - Mathematical Procedures (A1.1, A1.5, A1.6) - Units of Measurement and Conversions Among Units (App. 2) Problems for Extra Practice: - worksheet posted on web Office Hours: Mon. 11:30 am-12:30 pm, Wed. 11:00 am-noon

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

View Full Document
Scientific Communication Measurements or observations must be communicated unambiguously – Reporting measurements Units (SI) Scientific notation • Prefixes Significant digits – Describe as precise and/or accurate
Stating a Measurement In every measurement, a number is followed by a unit . Observe the following examples of measurements: Number and Unit 35 m 0.25 L 225 lb

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

View Full Document
The SI System Scientists recognized that a standard system of units was needed if measurements were to be useful In 1960, an international agreement set up a system of units called the International System (SI) Based on the metric system and units derived from the metric system Related decimal systems based on 10
SI Base Units All other units are derived from this system.

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

View Full Document
Quantity Definition of Quantity SI unit Area Length squared m 2 Volume Length cubed m 3 Density Mass per unit volume kg/m 3 Speed Distance traveled per unit time m/s Acceleration Speed changed per unit time m/s 2 Force Mass times acceleration of object kg·m/s 2 ( =newton, N) Pressure Force per unit area kg/(m 2 ) ( = pascal, Pa) Energy Force times distance traveled kg·m 2 /s 2 ( = joule, J)
Common SI barb2right English Conversions

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

View Full Document
Importance of Units!
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