Actually, the real point of this lab is to introduce you to the concept of uncertainty in measurements. Linear measure use the metric stick to measure the items listed below. About the book engineering metrology and measurements is a core subject for mechanical, production, and allied disciplines in all the major universities in india. What piece of lab equipment would most precisely measure a liquid volume of. Occasionally we include temperature, electrical charge or light intensity. Accuracy, precision, and significant figures openstax cnx. With the right technology, the levels of different pollutants in soils or water can be measured quite precisely.
Bertillons system of identification included what three categories of information. The method of determining the volume of an object by submerging it in water is called volume displacement. How different were the measurements made on the three balances. In formal terms, a scale of measurement is the assignment of numbers or symbols to measure an attribute. Mole lab continued 4 2017 linn cientiic inc ll iht eered materials for mole lab are available from flinn scientific, inc. Lab 1 density determinations and various methods to measure. It has been known since ancient times that the ratio of the circumference of a circle to its diameter is equal to the transcendental number represented by. Borrow a ruler and shape sheet from the front bench. Using a ruler, you measure the length of a rectangle to be 12. The metric system is based on units of 10, and conversion to higher or lower values is relatively easy.
We will see examples of both macroscopic and microscopic viewpoints throughout this book figure 1. Handle the mineral samples that are on reserve in the library. In part a of this lab, you will measure the dimensions length, width, diameter of several geometric shapes. To make laboratory measurements and become familiar with the measuring tools of chemistry. There is a task card at each station with instructions. What is the probability of two people having precisely the same 11 measurements. View lab report lab report 1 from chem 121 at ohio state university. Asked in chemistry, measuring tools what laboratory tool is used in measuring volume precisely. Reading measuring devices notes here are a couple of examples of graduated cylinders. Although there are a few good books available on metrology, the coverage of topics on mechanical measurements is either scanty or. Note that when measuring liquid volumes, it is important to read the graduated scale from the lowest point of the curved surface of the liquid, known as the liquid meniscus. The significance of the standard deviation is this. Which balance do you think would be the best to use in lab activities. Pick up a small paperback book or similar small object and estimate its mass.
For example, when measuring the activity of a radionuclide in a laboratory sample, it is generally necessary to specify the activity as of a certain date and time and whether the entire sample or only a certain fraction is of interest. Make measurements to the nearest 110 of a millimeter using a meter stick. The least count of a measuring instrument is the smallest change in the measured quantity that can be resolved on the instruments scale. A book of the names and address of people living in a city. The last chapter in this section features inspection methods and quality control. The volume water displaced is equal to the difference between the final volume and the initial volume, or. In the second part of the lab, you will use this value of d to accurately measure wavelengths in hydrogen. Measurements in the laboratory experiment chemistry. Density is defined as the mass per unit volume of a substance. To understand calibration of various measuring devices. An example of accuracy of measurements is having the following data. Calculate the area of this rectangle show work, reporting your answer to the correct number of significant figures. A conventional barometer or a gas pressure sensor may be used. Due to their measurement accuracy, they are particularly suitable for use in controlling, sorting, and inspection tasks in quality control workflows and processes that have an impact on costs.
When a piece of data is recorded, the next to the last digit reported is the number represented by the smallest increment marked on the measuring instrument. Counting is the only type of measurement that is free from uncertainty, provided the number of. The determination of the density of water a comparison of the accuracy and precision of a graduated cylinder and a pipet experimental. It is very important that you read the measuring devices we use in lab as accurately as possible. Measuring the dimensions of regular geometric shapes. Be sure to record your measured masses on your lab report. The new measure is not only used to distinguish the controllability or uncontrollability, but also can be used to meter precisely the state control ability of the systems, and maybe is a. There are several, depending on how large a volume and how accurately you wish to measure it. Precision is a measure of how close all of these measurements are to each other. Mass and linear measurements are basic units in the metric system. Water quality assessment experiment ecotoxicology is an extension of toxicology, the branch of biology that studies the ecological consequences of the effects of pollutants on organisms. Only rarely will a mass reading turn up with a zero on the end. In this lab, a beaker, two graduated cylinders and a burette will be used to measure liquid volumes, and their precision will be compared.
They also learn about different types of anemometers, realworld applications, and how wind speed information helps engineers decide where to place wind turbines. Measurement worksheets measurement is a practical topic that students will need for their whole lives, and these worksheets will help students go from basic concepts of length in both the english and metric systems to telling time, temperature, and more. Students in a chemistry lab are separating a solution into volumetric flasks, which. Use a vernier caliper to make measurements to the nearest 110 of a. Measuring up 7 answer to the ones place, so the proper answer is 87 cm. A piece of equipment used to measure volume in a lab would be the graduated cylinder. The calibration is done by measuring the mass of water contained in or delivered by the glassware. In the past, natural units of measurement, such as a foot, were commonly used. Precision is a measure of how close a series of measurements are to one another. Measure the dimensions of the two geometric shapes. If you are measuring something, you need units to describe the object. Everything you eat and do affects your metabolism, or the rate at which your body burns calories.
Also, i have no precisely known inductances at values this small, so cannot say what the instrument calibration accuracy is in this range. Precision is the degree to which several measurements provide answers. Lab 1 density determinations and various methods to measure volume goal and overview this lab provides an introduction to the concept and applications of density measurements. The densities of brass and aluminum will be calculated from mass and volume measurements. Measurement worksheets measurement worksheets for practice. In addition to the standard elements of a well written lab report described in the introduction to this manual, your report must include.
Accuracy is a measure of how close a measurement is to the correct or accepted value of the quantity being measured. Students need to understand measurement in all parts of life, and these exciting, dynamic worksheets will help students master length, time, volume and other subjects in both english and metric systems as they measure their own progress in leaps and bounds. Jan 24, 2018 issuu is a digital publishing platform that makes it simple to publish magazines, catalogs, newspapers, books, and more online. The quiz asks about measurements and experimentation results. Therefore, measurements can have precision but not very close accuracy. In a scientific experiment, the investigator examines the effects of variations in the independent. To illustrate the effects of precision on data, volumes will be determined by three different methods. The metric system measurement of length and weight. This indicates a low precision, high accuracy measuring system. Displacement measurement sensors are laser sensors which measure precisely with a measuring range of up to 1,000 mm. Lab report 1 measurements of mass and volume densitylab. What are the two main methods of criminal identification today.
The basic unit of volume used in the science lab is the liter l, which is. Identify one advantage and one disadvantage for this method. Here is how to determine how accurately a measuring device can be read. How can i use a triple beam balance to measure mass. Students create their own anemometersinstruments for measuring wind speed. The lab, the answer keys, and lab links for these labs are useful resources when studying. Above each column write the name of the unit that is abbreviated below it. Scientific notation second and third section on front homework. A thermometer preferably digital can be substituted for the temperature probe. A glycemic index diet helps you increase your metabolic rate for faster weight loss. Pipettes and burettes are calibrated to deliver specific volumes whereas, volumetric flasks are calibrated to contain basis. Write up the lab in your field book, refer to the following example.
We also saw that of two types of balances, one type of balance can more precisely measure mass than the other. Thus, a graph of voltage drop versus wire length should be a straight line. This lab helped us to discover that while the burette and the pipette are each as accurate as the circumstances of their usage allows, in this experiment the pipette is more accurate, but the burette is slightly more precise. Before beginning the experiment, make sure that you have a means of measuring the barometric pressure in the room. Perform calculations with measured quantities, rounding the answers to the. Introduction to measurement units and measurement one of the most important steps in applying the scientific method is experiment. Npl is the uks centre for measurement standards, and associated science and technology. The scientific method is an organized procedure for learning answers to questions. Metric measurement lab there are 7 stations set up in the classroom. Make sure you read the balance to two decimal places. While this measurement is much more precise than the original estimate, how do you know. How to measure the thickness of piece of paper answers. If accuracyprecision are important, im afraid youre going to have to obtain a much more expensive lab grade instrument, such as an inductance bridge, capable of measuring down to this level. They see how an anemometer measures wind speed by taking measurements at various school locations.
This guide was produced under the competing precisely project a measurement awareness raising campaign within the national measurement partnership programme, managed on behalf of the dti by the national physical laboratory. Lab 2 the oscilloscope stony brook physics laboratory. Typically we measure simple quantities of only three types. If the substance in question is a volatile liquid, a common method to determine its molar mass is to vaporize it and apply the ideal gas law, pv nrt to the data collected. Copy the data obtained by each member of your party. Review this quiz and worksheet combination to see what you know about a lab that measures an objects speed using very simple tools.
The second part of the book comprising chapters 1216 focuses on mechanical measurements. What piece of lab equipment would most precisely measure a. One way to do this is to report the result of a calculation with the correct number of significant. Take any item marked a,c,z,l and mass it on a balance. Here is how to determine how accurately a measuring. Which instrument would most accurately and precisely. Aqa gsce chemistry 91 required practicals lab book. Average the measured distances obtained by all of your party members by the various measuring methods. Build an anemometer to measure wind speed activity.
This lab provides an introduction to the concept and applications of density measurements. The number of significant figures that can be included depend on the markings on the device that is used. Measurement worksheets dynamically created measurement. The metric system measurement of length and weight introduction the scientific community and the majority of nations throughout the world use the metric system to record quantities such as length, volume, mass weight, and time. The difference between these two balances has to do with the number of significant digits that the balances are able to measure. A measurement can be precise while not being accurate, or accurate but not.
In a modern lab, you would use a digital scale to measure mass. Having studied elements of xrd book and indexed an. The equipment and supplies needed for each station are already at the station. High school chemistrymaking measurements wikibooks, open. Conclusions and discussion accuracy and precision lab. If the input has fewer significant figures, the answer will also have fewer significant. Lab 1 density determinations and various methods to. Commonly measured characteristics include dimension, position, and shape. What is the lab equipment used to measure mass answers. Learn vocabulary, terms, and more with flashcards, games, and other study tools. Objectives after completing this lab, you will be able to. The coverage is restricted to measurement techniques and systems that are complementary to engineering metrology. From these measurements we can interpret the data and draw conclusions.
High school chemistrymaking measurements wikibooks. Quantitative observations gather data by using measurements. In everyday speech, the terms accuracy and precision are frequently used interchangeably. Water quality assessment experiment marietta college. Use the triple beam balance that it is at your table as a guide. The density of water at a particular temperature is used to convert mass into volume. Precision refers to how close repeated measurements using the same device. Easily share your publications and get them in front of issuus. However, their scientific meanings are quite different. No prep books that are not boring that kids will enjoy. Measuring the volume of an irregularly shaped solid. The simple way is with a screw micrometer, just put the paper in, do up the jaws with the ratchet and there is your answer. Distinguish between accuracy and precision in measurements.
In this lab, you will compare the accuracy and precision of densities of solids measured by two different techniques. Average your own measurements obtained by the different instruments c. You can select different oblects and reading scales to practice measuring and reading real world examples. That has the same precision as 102, because they each have their last significant figure in the ones place. As mentioned before your lab notebook for this experiment will be pretty simple, basically consisting of some simple sketches and schematics make comments, supported with numbers from your observations, about how precise you think the oscilloscope is for measuring voltage and for measuring. There will be times when you multiply and divide measurements. Determination of molar mass by vapor density one of the properties that helps characterize a substance is its molar mass. Your basal metabolic rate, abbreviated as bmr and commonly referred to simply as metabolic rate, is the amount of calories your body burns at.
I would measure in a few places and average the results for best accuracy. Here r is the rydberg constant 1, which has been precisely measured and found to have the value r 10973731. Also, note that we had to round up, because we dropped a 5. Unfortunately, these units were somewhat arbitrary. These measurement worksheets are randomly created and will never repeat so you have an endless supply of quality measurement worksheets to use in the classroom or at. Make observations concerning the accuracy and precision that can be obtained. Speed is the rate at which an objects position changes, measured in meters per second. In both cases, you should record all digits displayed on the balance readout. Explore the latest questions and answers in precision measuring, and find precision measuring experts. The lab notebook will be a valuable tool for you during this experiment and an important information source for the final lab report. Since the current in the wire is constant, the voltage drop across a given portion of the wire is proportional to the resistance of that portion of the wire.