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Scientific Measurements and Estimated Digit Experiment. Chemistry for Health Sciences Laboratory
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Measuring is an important part of any science and chemistry is no exception. Considering that measuring is so important it is therefore critical that we learn how to measure the correct way. To begin with it must be clear that there are two types of measuring devices: analog and digital.
A digital device is one in which the measurement is provided to the scientist and the scientist simply writes the measurement down in their notes.
An analog device requires a bit more effort on the part of the scientist. In order to achieve the correct precision, the scientist must provide the “estimated digit. Every analog device has markings on them called hash marks or hatch marks. These marks represent a specific measurement (example: 1 ml, 1 cm, etc). The final digit in a measurement is always the estimated digit. This means that the digit just before the estimate must have been read using a hatch mark from the analog device. Let’s assume that the lowest increment that the hatch marks measures on a ruler is 0.1 cm. This means that the estimated digit would be 0.01 cm. Do not worry it gets easier with practice and experience. This video will provide you will lots of examples of measuring!
This video goes over the experimental details of Experiment 1: "Scientific Measurements" found on pages 11 through 23 in the "CHM1032L Chemistry for Health Sciences Laboratory Manual by Perdian and Betts. This includes "Measuring Distance", "Measuring Volume of Liquids", "Measuring Volume of Solid Objects" by direct measurement and by water displacement.
If you are a Broward College student taking this course you must purchase this manual from the bookstore.
If you are an educator that is interested in using the manual please contact me and I can provide details about how to order it for your classes. My email is rbetts@broward.edu.
Good Luck and Good Chemistry!
Please subscribe to my channel by clicking the link below! https://www.youtube.com/c/AllInwithDrBetts?sub_conformation=1Scientific
Like this video and leave a comment below!
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