Just as a pair of shoes equals 2 shoes, a mole of shoes is 6.022×10, Just as a dozen eggs equals 12 eggs, a mole of eggs is 6.022×10. For more information contact us at info@libretexts.org or check out our status page at https://status.libretexts.org. 37) Measure and record the temperature of the air in the laboratory room. It is not 12.3 feet.]. Note that the P200 officially has a range from 50-200μl. The temperature in Fahrenheit can be converted to Celsius using the formula: For example, to convert 60° F to ° C, subtract 32 (=28), multiply it by 5 (=140) and divide it by 9 (=15.56). Watch the recordings here on Youtube! The units are named using these prefixes: The table below shows how meters are related to five other measures of length. The number 0.526 rounded to the nearest 0.01 becomes 0.53. The arrow points to the bottom of the meniscus in the photograph below. The OpenLab is an open-source, digital platform designed to support teaching and learning at City Tech (New York City College of Technology), and to promote student and faculty engagement in the intellectual and social life of the college community. Measure the width of a standard 8.5 × 11 inch page using a small plastic ruler or a meter stick. 20 μL should be measured with a P20 rather than with a P200. Liquids will roll into the piston this way. The 90 cm mark can be seen in the center of the photograph. A unit of measurement is a defined magnitude of a quantity that it used as a standard for measurement for the same kind of quantity, such as measurements of length, weight, and volume. An exception to this rule is the P200 labeled 50-200 μl. Prepare seven dye mixtures as illustrated in the table below. This site is maintained by Jeremy Seto. Pipettors are more accurate in the upper part of their range. Notice in the table above that one milliliter (ml) equals one cubic centimeter (1 ml = 1 cc or cm3). 36) 0.5 gallons = _____ liters Round your answer to the nearest 0.01 liter. Learn more about accessibility on the OpenLab, © New York City College of Technology | City University of New York, Nucleic Acids: DNA extraction and Dische’s Diphenylamine test (Activity), Quantitative Detection of Protein (activity), Quantitative Detection of Protein (SpectroVis Plus), Do Larger Things Diffuse Faster? All of the measurements done in this course will use the metric system. Have questions or comments? Quick, free, online unit converter that converts common units of measurement, along with 77 other converters covering an assortment of units. Depress the plunger in destination tube to the first stop. Measurements in science use metric units. The LibreTexts libraries are Powered by MindTouch® and are supported by the Department of Education Open Textbook Pilot Project, the UC Davis Office of the Provost, the UC Davis Library, the California State University Affordable Learning Solutions Program, and Merlot. Record your measurement in 4) millimeters, 5) centimeters, and 6) meters. 20) 8.53 inches = _____ m Round your answer to the nearest 0.001 m. 21) 12 feet, 3 inches = _____ m Round your answer to the nearest 0.01 m. [Hint: First, convert 12 ft. 3 inches to feet.

They are essential for your success in this course and shared amongst numerous students. For example the number 1,930,000,000,000,000,000 is easier to write as 1.93 × 1018. The metric system is an internationally agreed-upon measurement system based on decimals or powers of 10.Scientists use a refined version called the International System of Units (abbreviated SI).In biology, you will often find a need to describe measurements of length, volume, mass, time, temperature or amount of substance. Be sure to read the water at the bottom of the meniscus. Never allow liquid to get into the micropipettor. Notice that each centimeter is divided into 10 mm. You must subtract these two number to determine how many places to move the decimal point. Notice that each of the units in the table above are related to meters by a multiple of 10. With the increased sensitivity of the equipment, the number of significant figures increases. Never use the micropipettor without a tip. https://www.youtube.com/watch?v=uEy_NGDfo_8. It also shows the English equivalent. Use the following information to perform the calculations below. Carefully draw the plunger up slowly and follow the liquid to avoid drawing air. One cubic centimeter equals one milliliter (1cc = 1ml). Metric to English: 1 g = 0.0352739 ounces = 0.0022046 pounds, English to Metric: 1 ounce = 28.34951 grams; 1 pound = 453.5924 grams.

While we have P100 pipettors for this range, they appear too similar to P20 that they are often confused. 22) How much does the penny weigh in grams? But units of measurement and knowing how to convert them is super important to science. It has a sensitivity of 0.001 g. Due to its sensitivity, moving air will cause it to fluctuate. Historically, many different systems of units have been used, where a system of units is defined as a collection of units of measurement with rules that relate them to each other. 39) Measure and record the temperature of boiling water. Not only is it used by scientists throughout the world, but most nations have adopted it as their standard of measurement. We also acknowledge previous National Science Foundation support under grant numbers 1246120, 1525057, and 1413739. Unless otherwise noted, LibreTexts content is licensed by CC BY-NC-SA 3.0. Just as a pair of shoes equals 2 shoes, a mole of shoes is 6.022×10, Just as a dozen eggs equals 12 eggs, a mole of eggs is 6.022×10. What type of measurement is indicated by each of the following units?

This illustrates accuracy. Do not use scientific notation (exponents) or fractions in your answers to the questions below. For example, a second way to write the number 1,000 is 1 × 103.

Missed the LibreFest? Scientists use a refined version called the International System of Units (abbreviated SI). which states 1000 milliliter in every 1 liter, pay attention to the units and how we’ve canceled out the ml in the numerator of 500ml and in the denominator in the conversion of 1L in 1000ml. Several of the questions in this exercise ask you to round your answers. Rounding a number to the nearest 0.1 means that your answer should display one digit to the right of the decimal point. 57 cm = 0.0057. 35) 2.3 quarts = _____ liters Round your answer to the nearest 0.01 liter. Watch the recordings here on Youtube! Pipettors are made by many different manufacturers and thus all do not look the same. Record your answers to the questions below in your notebook. Metric Conversion Questions? Exponents are useful when writing numbers that are very large or very small. Scientists use a refined version called the International System of Units (abbreviated SI). Larger unit - move decimal point to the left to make a smaller number, Smaller unit - move decimal point to the right to make a larger number, This problem is solved by subtracting the exponents. In biology, you will often find a need to describe measurements of length, volume, mass, time, temperature or amount of substance.

Small programs, which can help in common laboratory calculations. Those calculations were automated that are really useful in laboratory work. This lab will illustrate the Rainin Pipetman® micropipettors. Instruments have a finite amount of accuracy and it is important to report measurements within that level of accuracy. The tables below show similar units based on grams (mass) and liters (volume). Therefore, to convert 2.6 cm to um, you must move the decimal point 4 places to the right. Sometimes volume is measured using cubic centimeters (abbreviated cc or cm3). Round your answer to the nearest 0.1. This illustrates precision. For example, the number 0.526 becomes 0.5. Metric to English: 1 meter = 39.37008 inches = 3.28084 feet, English to Metric: 1 inch = 0.0254 meters; 1 foot = 0.3048 meters. The number 0.4382251 rounded to the nearest 0.0001 is 0.4382. Each measurement is on target and also highly repeatable. Remove the beaker from the scale and weigh the penny without using the beaker. Originally, P200 were labeled 20-200 μl and we know that the lower range is less precise on these. Pipetting sequence. The equation is below: \[\mathrm{°F = \left(\dfrac{9}{5}\: °C\right) + 32}\]. The metric system is an internationally agreed upon measurement system based on decimals or powers of 10. Place a penny in the beaker to obtain its mass. If the number to the right of the last digit being displayed is 5 or greater, the displayed number is increased by 1. So, I wanted to take a moment to share a bit more about units, along with some of the key conversion factors your students should memorize. Biology uses Celsius predominantly because of the range in which organisms live. (Activity), Absorbance Spectra of Photosynthetic Pigments, DNA miniprep by Alkaline Lysis (activity), In silico Restriction Digestion (activity).

Scientists use a refined version called the International System of Units (abbreviated SI).In biology, you will often find a need to describe measurements of length, volume, mass, time, temperature or amount of substance.

In this case, the value is smaller by 1,000X. Subtract the two numbers: (-2 - (-6) = 4). 29) Use a 50 or 100 ml graduated cylinder to determine the amount of liquid that a test tube can hold (it's volume). Unless otherwise noted, LibreTexts content is licensed by CC BY-NC-SA 3.0. The photograph below shows the end of a meter stick. [ "article:topic", "license:ccbyncsa", "authorname:cunyopenlab" ]. This illustrates Accuracy AND Precision.

The table below shows the standard unit of length, mass, volume, and temperature in the metric system. The four pipettor sizes (P10, P20, P200, P1000) used in our lab will measure from 1 μL – 1000 μL as shown below. You must first zero the scale before weighing the penny.

Contact jseto [at] citytech.cuny.edu regarding corrections or comments.

Banner image derived from danielcampos, sunshine-91, zhaolifang on vecteezy.com. Never turn the volume adjuster above or below this range indicated on the pipettor or you risk breaking the instrument. All of the measurements done in this course will use the metric system. Liters are 1,000X (10, Since we are moving to a larger unit, our value will be smaller.

Part A . Significant figures,  report the number of digits that are known to some degree of confidence with the measuring device. Missed the LibreFest? Meters, grams, and liters (see the table above) form the basis for larger or smaller units. You must subtract the exponents in order to determine how many places to move the decimal point. Liters are the larger unit. 7) Which unit of measurement (kilometer, meter, centimeter, millimeter, micrometer, or nanometer) would be most appropriate for measuring the width of this room?

What is the volume of water in your cylinder? Write all of the zeros. In biology, you will often find a need to describe measurements of length, volume, mass, time, temperature or amount of substance. The laboratory scale shown below uses weight to determine mass. Never set the micropipettor on the edge of the bench; this may result in the micropipettor falling or being knocked onto the floor. The metric system is an internationally agreed upon measurement system based on decimals or powers of 10. This weakens the seal on the o-rings and can damage them. The site also includes a predictive tool that suggests possible conversions based on input, allowing for easier navigation while learning more about various unit … Choices are in the last column. These are precision instruments which can easily be damaged.

2.6 cm = 26000, The exponent for um is -6. The number 0.4382251 rounded to the nearest 0.1 is 0.4.



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