Lecture: Measurement. English system: Metric system:

Slides:

Advertisements

Similar presentations

Advertisements

Scientific Measurement. All measurements have a number value AND a unit.

The volume we read from the beaker has a reading error of +/- 1 mL.

Significant Figures Every measurement has a limit on its accuracy based on the properties of the instrument used. we must indicate the precision of the.

UNIT: Chemistry and Measurement

Ms. Albarico. Students are expected to determine the accuracy and precision of a measurement. demonstrate an understanding of concerns and issues that.

Measurements: Precision, Accuracy and Uncertainty

Bell ringer 01.

Measuring: Using the Metric System in Science. graduated cyclinder.

MEASUREMENT IN SCIENCE Making our efforts worthwhile.

Topic 11: Measurement and Data Processing

1.07 Accuracy and Precision

SI = Système Internacional d’Unités

Measurement Notes From pages in the text Honors Intro Physics Friday, Sept. 4 th.

Uncertainty in Measurement Professor Bob Kaplan University Department of Science 1.

Accuracy vs. Precision Some people would say that Trial 2 would be more accurate than Trial 1 But Accuracy is how close our measurement is to the actual.

Making Measurements David A. Krupp, Ph.D. PaCES/HIMB Summer Program in Environmental Science.

Scientific Measurement What is density? From your experimental data, were the densities of the similar objects the same or different? Why? What does this.

Chapter 2 Measurement & Problem Solving. Uncertainty There is a certain amount of doubt in every measurement – It is important to know the uncertainty.

Question 1 Rules for significant figures.

Our Discussion Goals To define quantitative observations. Define the measurements of length, mass, and volume. To identify the basic types of measurements.

Welcome to Chemistry 116! Lab Safety and Proper Procedures Labs 1.

DO NOW: Answer the following questions

Chapter 2 “Scientific Measurement” Standards for Measurement Accuracy vs. Precision Significant Figures.

Measurement Basics Physical Science. Why is it important to make accurate and precise measurements? Accuracy is the correctness of a measurement. If your.

1 1.5 Uncertainty in Measurement. 2 Measurements are always uncertain because measuring instruments are never flawless and some estimation is always required.

Scientific Measurements Calculations, and Values.

MEASUREMENT. Chapter One: Measurement  1.1 Measurements  1.2 Time and Distance  1.3 Converting Measurements  1.4 Working with Measurements.

Reading Scales Section 1.3. Our Metric Rulers are Marked off in Centimeters 10 centimeters are in one decimeter.

Measurement Science 10. Measurement and Precision Measurements are always approximate Measurements are always approximate There is always some error involved.

Instruments of Measurement. A balance is used to measure the amount of matter an object contains and is measured in grams.

Scientific Measurement Scientific Measurement uses the _______ _______ The metric system is based on the number ___________ The metric system uses prefixes.

Chapter 1 Chemical Foundations. Section 1.4 Uncertainty in Measurement 2 Return to TOC Copyright © Cengage Learning. All rights reserved Precision and.

Accuracy and Precision

  Volume is defined as the amount of space taken up by a three-dimensional object. What is Volume.

Measuring Note Cards Purpose: To measure the dimensions of an object as accurately and precisely as possible and to apply rules for rounding answers calculated.

Meters, Liters, and Grams. Oh, My! T. Trimpe 2008

Volume: The measurement of the amount of space an object occupies. 1. Regular Objects Units = cm 3 2. Liquids Units = mL 3. Irregular Objects Units = mL.

Measurement In science, the Metric system is used. It is a universal measurement system based on multiples of 10. This makes conversions from one unit.

$200 $300 $400 $500 $100 $200 $300 $400 $500 $100 $200 $300 $400 $500 $100 $200 $ 300 $400 $500 $100 $200 $300 $400 $500 $100 Oh mL, Oh My! Mass ‘em up!

WEEK28 PHYSICAL SCIENCE VOCABULARY. 1) MODE Number that appears most often in a set of data.

Significant Figures SPH3U. Precision: How well a group of measurements made of the same object, under the same conditions, actually agree with one another.

All measurements are subject to uncertainties. All instruments used are influenced by external circumstances, and the accuracy of a measurement may be.

CHAPTER 3: MEASUREMENT. ACCURACY AND PRECISION Can never be exact Instrument marking can’t be fine enough Defective instrument Environmental conditions.

Accuracy vs. Precision. Calculations Involving Measured Quantities The accuracy of a measured quantity is based on the measurement tool. The last digit.

1 1.1 What Chemistry Is About Measurements Using clear standards of measurements, we can communicate more effectively in answering simple questions.

Measurement Chapter 2. Units in Lab In lab we cannot always measure in SI units. In lab we cannot always measure in SI units.Mass Grams (g) Volume Milliliters.

READING BETWEEN THE LINES Estimate one place on non digital equipment. (rulers, graduated cylinders) 6 7 cm 6.42 cm If it is exactly on the line 6.60 cm.

Accuracy, Precision and Significant Figures. Scientific Measurements All of the numbers of your certain of plus one more. –Here it would be 4.7x. –We.

Chapter 3.1 Accuracy and Precision Significant Figures.

MEASUREMENT TOOLS.

KEY TERMINOLOGY / CONCEPTS ➢ Accuracy: How close the measurement is to the accepted value, your “correctness” ➢ Precision: How well the measurement can.

Significant Figures And Mathematical Calculations.

Significant Figures SIGNIFICANT FIGURES You weigh something and the dial falls between 2.4 lb and 2.5 lb, so you estimate it to be 2.46 lb. The first.

Unit 1 Significant Figures in Measurements

Measuring Liquid Volume

Place value and rounding numbers

Accuracy vs Precision.

Do Now & Announcements Grab a Handout (for after the quiz)

Review of Essential Skills:

Measurement Notes.

September 16, What instruments can be used to take the following measurements: Length, Mass, Volume? 2. When somebody says they made an accurate.

Measurement, precision, accuracy and inquiry

1.1 Measurements A measurement is a determination of the amount of something. A measurement has two parts: a number value and a unit.

Measurement Notes.

Procedure for calculating density

Measurement (Chap. 1) Have all students measure 20 Al bars and 30 rulers.

Presentation transcript:

Lecture: Measurement

English system: Metric system:

Resolution: Smallest interval a tool can measure: how fine/close: # of decimal places: resolutions of your tv? Accurate: How close a measurement is to the true value: bulls-eye, cup/hole in golf? Precision: how close together repeated measurements are: arrows could be way off for accuracy but all grouped together; what could cause this?

When measuring you must ALWAYS determine what the resolution of the scale is. For the following scales, determine the resolution first, then measure for accuracy where the arrow points; Remember: no units = no credit

What is the measurement of the ruler at the arrow? Resolution? Accuracy? Units?

What is the measurement at the arrow? Resolution? Accuracy? Units?

How precise can this cm ruler be? What is the arrow measurement? Resolution? Accuracy? Units?

Where is the arrow positioned? Resolution? Accuracy? Units?

Reading a graduated cylinder: always at the bottom of the meniscus

How much liquid is in this graduated cylinder? Resolution? Accuracy? Units?

What is the volume in this graduated cylinder? Resolution? Accuracy? Units?

What is the volume in this graduated cylinder? Resolution? Accuracy? Units?

Read the volume in the graduated cylinder Resolution? Accuracy? Units?

What is the correct volume in the beaker? Resolution? Accuracy? Units?

Rounding Rules Accuracy also depends on rounding Your calculator will often give you a number indicating a greater degree of accuracy than possible (yes calculators can be wrong) so… –You must round –When a # is > to 5, round up: resolution to the tenth: 3.76  3.8 –When a # is < 5, round down: resolution to the tenth: 5.14  5.1