BOX 2.1 Chapter Preview/Review What does the term SI mean? When are abbreviation
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BOX 2.1 Chapter Preview/Review What does the term SI mean? When are abbreviations of units capitalized? Who are some of the scientists who have had a metric unit named in their honor? What is the relationship between meters, kilometers, and millimeters? Which variables incorporate force? What is the caloric equivalent of 1 L of oxygen uptake? In what three scales may temperature be expressed? In what units may pressure be expressed? What do the terms precision and accuracy mean? What is meant by the concept of unit analysis?Explanation / Answer
1.The International System of Units (systeme internationale , in French) is a scientific method of expressing the magnitudes or quantities of important natural phenomena. like meter (m)is the SI unit of displacement or length, kilogram (abbreviation, kg) is the SI unit of mass.
2. 1) the unit's name comes from a proper name like being named after people, like :
3. some of the scientists are:
4 10 millimeters (mm) = 1 centimeter (cm). 100 centimeter = 1 meter (m) = 1,000 millimeters. 1000 meters = 1 kilometer (km)=100000 cm = 1000000 mm
5.metre, unit of length(m), the kilogram, unit of mass(kg), the second, unit of time(s)
6.3.5 ml of oxygen per kilogram of body mass per minute) and is roughly equivalent to the expenditure of 1 kcal per kilogram thus 1000/3.5= 285.71x1kcal = 285.7 kcal per kilogram is the expenditure of energy for 1L of oxygen consumption
7. Fahrenheit, Celsius, and Kelvin are the three used temperature scales
8. pressure can be expressed in
9.Accuracy refers to the closeness of a measured value to a standard or known value like obtaining a weight measurement of 3.2 kg for a given substance, with weight of 10 kg is inaccurate as the measured value is not close to the known value getting a value close to 10 would be considered more accurate, whereas variation you see when you measure the same part repeatedly with the same device, the less the variation, more precise is the measurement
10.its a way of including units of measurements as factors while computing a problem. Also known as dimensional analysis ,it is the analysis of the relationships between different physical quantities by identifying their base quantities (such as length, mass, time, and electric charge) and units of measure (such as miles vs. kilometers, or pounds vs. kilograms vs. grams) and including these dimensions throughout calculations or comparisons
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