Significant Figures There are two kinds of numbers: Exact Inexact Example: There Example: Any are twelve eggs measurment in a dozen
If I were to measure a piece of paper, I might get 20.15 mm You might get 20.14 mm. Somebody else may get 20.16 Who is right ????? Precision vs. Accuracy Accuracy Precision
- Refers to how - Refers to how closely individual measurements agree with each other closely a measured value agrees
with the correct value Remember..there is uncertainty in all measurement but the precision is determined by the measuring device. In any measurement, the number of significant figures is the number of digits believed to be correct by the person doing the measuring It also includes one estimated digit.
Here are 3 examples of when sig. figs. are important when measuring volumes in the lab. A beaker A graduated cylinder
A buret A rule of thumb: Volumes should be read to 1/10 of the smallest division. Example: If the smallest division is 10 mL, the volume would be read as having an error of 1 mL. A Beaker
The smallest division is 10 mL-so we can read the volume to 1 mL. The volume in the beaker is 47(+ or ) 1mL. It might be 46it might be 48. So, how many sig. figs.???? (2) - The 4 we know for sure, plus the 7 that we had to
estimate. A Graduated Cylinder
The smallest division is 1 mL so we can read the volume to 0.1 mL. The volume could be read as 36.5 (+ or -) 0.1 mL. The true volume could be 36.4 or 36.6. How many sig. figs??? (3)- The 3 and 6 we know for sure- the 5 had to be estimate. A Buret
The smallest division is 0.1 mL so we can read the volume to 0.01 mL. A good volume reading would
be 20.38 (+ or -) 0.01 mL. An equally precise answer would be 20.39 or 20.37. How many sig. figs.???? (4)- The 2, 0, and 3 we know for sure, the 8 we had to estimate. Conclusion: Significant figures are directly linked with measurement. Now, how do we determine significant figures?
Determining the number of sig. figs. in a number. Picture a map of the U.S. If a decimal point is present, count from the Pacific side. Start counting with the first nonzero digit. All digits from here to the end, including zeros, are significant. Examples:
Significant Figures in Calculations: Rules for Multiplication and Division The answer contains no more significant figures than the lease accurately known number. Examples: The number with the
least # of sig. figs. has 2 sig. figs. Therefore, the answer must have 2. The number with the least # of sig. figs. has 3 sig. figs. Therefore, the answer must have 3. Rules for Addition and Subtraction The number of sig. figs. is determined by the location of
digits in the number with the largest uncertainty, not the number of significant figures in the number. Examples: The least precise number is 2.02. It has sig. figs. out to the hundredths place. Therefore the answer will have sig. figs. out to the hundredths
place. The least precise # (1.0236) has decimals carried out 4 places. Therefore the answer will have sig. figs. carried out 4 decimal places.
MSgt Smeac Bamcis United States Marine Corps 1 April 2014 Bachelors Officers Quarters Camp Johnson, North Carolina For years this Marine has stood the watch. While many of us lay about our bunks at night, this Marine stood the watch....
Answer (3) Vladimir is the next driver. He continues the journey on an eight-hour drive to the Belarus border and Brest. He waits until the change in the guards and then drives the car to the checkpoint where he hands...
Why Wear Masks. Conceal Individual Identity- so that no one person can stand out & gender is concealed. Seen as a GROUP, not as individuals\ See no gender, race, or religion… "Delegate Zero" is their spokesperson & does not wear...
2 EMT-Ps and . Crit. Care Nurse. Routine. plasma:PRBCs. in flight when needed. Advanced airways and RSI. Ketamine analgesia. Chest tubes and thoracotomies with aortic cross-clamping. Tranexamic. acid. Only one; used for most critical casualties
Ad erume commos solorem quiduciliqui odi nusam acia dolorep udaepero voluptatur sit apit, nonsendes conectas milibus as sam remodit iusdam sim sam, verciandunt, ulpa vercil mo estiore pere volorest as re, corporit et debis re, con restori bernatem elique ium...
Chapter 13, Section 3. ... (Italian and Spanish). 88% live in cities. 13 million in Buenos Aires alone. Wealthiest country in Latin America. Urbanization. Buenos Aires is a vibrant capital city that looks to Europe for its fashions, art, food...
FAMOUS ENTREPRENEUR By: Zeke Huffman Mrs. Lee my entrepreneur is colonel sander Colonel sanders is the founder of KFC. His full name is Harland David Sanders. He was born in September 9, 1890. He died in December 16, 1980. Born...
Ready to download the document? Go ahead and hit continue!