PPT-Dimensional analysis and Units of Measurements

Dimensional analysis Dimensional analysis uses conversion factors to convert from one unit to another Also called Factor Label and railroad tracks You do this in your head all the time How many quarters are in 4 dollars . III. Unit Conversions . (p.39-41). SI Prefix Conversions. Dimensional Analysis. A. SI Prefix Conversions. 1. Find the difference between the exponents of the two prefixes.. 2. Move the decimal that many places.. Organized method of problem-solving . Used in chemistry, physics, engineering, and medicine. Communicates the path to scientists that follow your work. Records your own path for your future use. Dimensional Analysis. The metric system. Becoming more common in our country.. The SI system. Developed in 1960, also called the international system of units.. Set of seven standard quantities of which all others can be derived.. Dimensional Analysis. In Chemistry and every-day life you will often need to express a measurement using a different unit than the one that was initially used. . To convert between units we can use . The properties of matter must be measured correctly and reported without ambiguity. . Value- A quantities description that includes both a number and a unit. Units- quantities defined by standards that people have agreed to use to compare one event/object to another. You and your friends want to have a movie marathon. All three movies last a total of 390 min. How many hours will it take to watch all three movies?. = 6.5. min. How do we get the unit to change to hours?. Systems of Units. Section 2.3. Physical Quantity. Unit. Abbreviation. Mass. Kilogram. Gram (CGS). kg. Length. Meter. Centimeter (CGS). m. Time. Second. s. Temperature. Kelvin. K. Amount of substance. Conversion Problems. Density. Measurements and their Uncertainty . Do any of these signs list a measurement?. - Measurements contain BOTH a . number. and a . unit. .. All measurements depend on units that serve as reference standards. The standards of measurement used in science are those of the metric system. . You identified parallel planes and intersecting planes in three dimensional figures. . Draw isometric views of three-dimensional figures.. Investigate cross sections of three- dimensional figures.. Vocabulary. How can we convert units?. Measurements. Every measurement needs to have a value (. number. ) and a unit (. label. ).. Without units, we have no way of knowing what the actual measurement is. Sometimes the units that something is measured in, need to be converted into a comparable unit for a calculation. conquer the Chemistry EOC: Balancing Equations and Stoichiometry Chemistry TEKS 8 (A) define and use the concept of a mole; 8 (B) use the mole concept to calculate the number of atoms, ions, or molecules in a sample of material; Homework for Chapter 1. Read Chapter 1. HW 1: pp. 26-31: 2,3,8,16,18,19, 28,29,38,39,52,54,56, 62, 68, 73, 74, 75.. Warmup. Perhaps the most recognizable equation in physics comes form Einstein’s theory of relativity: . Dr. J. Badshah. University Professor – cum - Chief Scientist. Dairy Engineering Department. Sanjay Gandhi Institute of Dairy Science & Technology, Jagdeopath, Patna. (Bihar Animal Sciences University, Patna). A way of converting between units for problem solving. Remember all units have to be in meters, kilograms, and seconds. You can also use dimensional analysis as a way of checking your units to make sure your problem is correct.