Question 74
Question The metric system is based on decimals, as the same way that moneyis. That is, the units of the metric system are in tens, hundreds or thousands. The system is used in all parts of the world to measure volumes, lengths, areas and weights. The metric unit for length is the meter (m). It is separated into one hundred (100) smaller units called centimeters (cm). The prefix centi- in centimeters means one hundredth (1/100), just as a cent is one hundredth (1/100) of a dollar. Each centimeter is separated into ten smaller units called millimeters (mm). The prefix milli- means one thousandth (1/1,000) since there are a total of one thousand (1,000) millimeters in a meter.Exercise 1.Using the meter stick measure the length of your thumb from the webbing to the tip. Express the answer first in millimeters (mm) and then in centimeters (cm). For example one hundred and twenty (120) millimeters is equivalent to twelve (12) centimeters since there are ten (10) millimeters per centimeter.Length of your thumb in =_________0,12___________mm =____________________ cmNext measure in centimeters the interpupillary distance of the eyes in your lab partner. Your lab partner should stare straight ahead as you measure the distance between his or her pupils. The interpupillary distance is measured by optometrists to determine the proper distance between lens centers in glasses. Interpupillary distance in cm ____________________Calculate the surface area of the bottom of your shoes by measuring them at their widest and longest points. Multiply these two figures to get the area.Length in cm___________ X Width in cm_____________ = Area ____________ cm2The answer will come out in square centimeters (cm2), which is one of the metric measurements for area. Others would be square millimeters (mm2) and square meters (m2). If you divide your weight by your answer, you would have a measurement of the amount of pressure applied to the floor by your foot. Exercise 2.The unit of volume for the metric system is the liter (L) for liquids and gases and the cubic meter (m3) for solids. There are one thousand (1,000) milliliters (ml) in one (1) Liter (L).One use of volume measurements in physiology is to measure the vital capacity. Take three or four deep breaths and exhale one breath completely into a balloon. Force as much air as possible. Immerse the balloon into a large graduated cylinder and estimate the rise of the water level using the scale marked on the side of the cylinder. The displaced volume is exactly equal to the volume of what you have immersed and if you did not push your hand in should give an accurate measurement of your vital capacity. The vital capacity is used only in emergency conditions or in heavy exercise. Smokers and city dwellers tend to have a low vital capacity, which means they have a poorer capacity for responding to emergencies. Vital capacity in ml = ____________________Exercise 3.The unit of weight in the metric system is called the gram (g). There are one thousand (1,000) grams in a kilogram (kg) and one thousand (1,000) milligrams (mg) in a gram.There are 2.2 pounds in one (1) kilogram. You can convert from pounds (lb) to kilograms (kg) by using the formula: Pounds = kilograms 2.2Calculate your weight in kilograms by dividing it by the number 2.2. Your weight in pounds = Your weight in kilograms 2.2 Weight in kilograms = ____________________Convert your answer into grams. Your weight in kg X 1,000 = your weight in grams Weight in grams = _______________________Exercise 4.Density is a way of relating weight and volume. A ball of cotton and a piece of iron, even though they are of equal volume, will still weigh differently. This is due to the difference in their density.Weigh your ten (10) ml graduated cylinder on your metric balance. This is called taring your balance and the weight you measure is called the tare or empty weight.Add to the tared cylinder ten (10) ml of water and weight it again. Subtract the tare weight from this weight. The result will be the weight of the water.Since we know the volume of the water (10 ml) and its weight, we can calculate the density: Density of water = Weight of the water Volume of water Density of water in g/ml = ___________________The answer will come out in grams per millimeter (g.ml), which is a unit of density. Repeat the experiment using ten (10) ml of ethyl alcohol. Are the densities of water and ethyl alcohol the same? If not, which is greater? Density of ethyl alcohol in g/ml = ___________________How would you be able to measure your own body’s density? You would need to know your weight and your volume. How could you estimate your body’s volume? Health Science Science Nursing Share QuestionEmailCopy link Comments (0)
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