In-Class Worksheet 1 - Metric Conversions-1-1

Names: Kaya Brown, Faye Yan Section # & Bench #: 008, 3 COMPLETE AS A PAIR OF 2! Biology 2112/2912 - Lab 1 - Techniques of Measurement 1 In-Class Worksheet 1 - ( 10 points ) Due: end of lab TODAY Please complete the following questions and fill in the tables using your data from today’s lab. A. Developing Proficiency with Measurement - Length 1. Obtain a small plastic ruler that is marked with both centimeters (cm) and millimeters (mm). ( 1 pt ) a. How many centimeters are along the length of the ruler? 15 cm b. How many millimeters are along the length of the ruler? 150 mm c. From the above, how many millimeters are in 1 centimeter? 10 mm 2. Some units that we use for length are not found on the ruler, yet are commonly used in Biology, including the micrometer (μm) and the nanometer (nm). Use the following table to answer the questions below it. ( 1 pt ) a. How many nanometers are in 1 millimeter? 1 x 10^ -6 b. How many meters are in 1,000,000 centimeters? 1 x 10^4 c. How many micrometers are in 3000 nanometers? 3 Table 1: Diameter measurements of circle from bench (Figure 1 on bench) ( 1 pt ) Measurement # Length (mm) Length (cm) Length (m) Length (μm) 1 95 9.5 .095 95,000 2 93 9.3 .093 93,000 3 94 9.4 .094 94,000 Average 94 9.4 .094 94,000 Table 2: Diameter measurements of circle in scientific notation ( 1 pt ) Length (mm) Length (cm) Length (m) Length (μm) Average 9.4 x 10^1 9.4 x 10^0 9.4 x 10^-2 9.4 x 10^4

Names: Kaya Brown, Faye Yan Section # & Bench #: 008, 3 COMPLETE AS A PAIR OF 2! Table 3: Bone measurements with various tools ( 1 pt ) Length (cm) Using meter stick Circumference (cm) Using measuring tape Pair 1 26.0 5.3 Pair 2 25.5 5.6 B. Developing Proficiency with Measurement - Mass & Volume 1. Mass is measured using the units of grams (g) derived from a kilogram (kg) SI standard. Common subdivisions of the gram (g) in Biology are the milligram (mg) and the microgram (μg). Given what you learned above during the length conversions, please answer the following: ( 1 pt ) a. How many grams are in 1 kilogram? 1000 g b. How many micrograms are in 1 milligram? 1000 μg Table 4: Taring objects on the electronic balance ( 1 pt ) Object Pre-tared mass (g) Tared mass (g) Paper Clip 6.6 0.3 6” ruler 19.3 13.1 1. Liquid volume measurements are typically expressed in units of the liter (L), milliliter (mL), and the microliter (μL). ( 1 pt ) a. How many milliliters (mL) are in 1 liter? 1000 mL b. How many microliters (μL) are in 1 liter? 1 x10^6 μL