Length metric units

The primary unit of length in the metric system is the meter, which is 3.37 in. longer than a yard. The same prefixes are used with the meter as with all other metric units. 

The only metric units that are cubed are units of length— any unit ending in m— to give a unit of volume. 

I The metric units used to report volumes may involve liters or the cube of a length unit. 

English units are based on inconsistent standards. When that medieval king s thumb became regrettably unavailable for further consultation, the standard for the inch was changed to the length of three grains of barley, placed end to end—not much of an improvement. Metric units, on the other hand, are based on defined and controlled standards, not on the whims of humans. 

Traditionally, measurements in the clinical laboratory have been made in metric units. In the early development of the metric system, units were referenced to length, mass, and time. The first absolute systems were based on the centimeter, gram, and second (CGS) and then the meter, kilogram, and second (MKS). The SI is a different system that was accepted internationally in 1960. The units of the system are called SI units. 

List the metric units without prefixes and the corresponding abbreviations for length (meter, m), mass (gram, g), volume (liter, L), and energy (joule, J). (Section... 

The conversion factor 2.54 cm/in. can be used to convert from an English to a metric unit of length. 

Because the inch-centimeter relationship is defined to be exact, all English-metric unit comparisons of length are also exact when used with the number of digits shown below. This exactness is only true for length comparisons. 

It is often necessary to convert one metric unit to another. Suppose you needed to convert 4.5 cm into the equivalent length in millimeters. A conversion factor is used to do this. Conversion factor statements always have the form ... 

The standard metric unit of length, the distance between two points, is the meter. Large distances are measured in kilometers smaller distances are measured in millimeters or centimeters. Very small distances such as the distances between atoms on a surface are measured in nanometers (nm) ... 

The standard metric unit of time is the second. The need for accurate measurement of time by chemists may not be as apparent as that associated with mass, length, and volume. It is necessary, however, in many applications. In fact, matter may be characterized by measuring the time required for a certain process to occur. The rate of a chemical reaction is a measure of change as a function of time. 

A newborn is 21 inches in length and weighs 6 lb 9 oz. Describe the baby in metric units. 

Tex - A metric unit used in the textile industry to measure the density of a single fiber of yam. One tex equals a density of one gram per kilometer of length, or 1 mg/m. One tex equals 10 drex or 9 denier. See also Denier. 

Comparison of English and metric units for length on a ruler... 

Which metric unit of length or distance is most comparable in scale to each of the following English system units for making measurements ... 

In 1960 an international agreement was reached specifying a particular choice of metric units for use in scientific measurements. These preferred units are called SI units, after the French Systeme International d Unites. This system has seven hose units from which all other units are derived (T TAB LE 1.4). In this chapter we will consider the base units for length, mass, and temperature. 

Many properties of matter are quantitative, that is, associated with numbers. When a number represents a measured quantity, the units of that quantity must be specified. To say that the length of a pencil is 17.5 is meaningless. Expressing the number with its units, 17.5 centimeters (cm), properly specifies the length. The units used for scientific measurements are those of the metric system. 

The basic metric unit of volume is the liter (L), which is defined in terms of metric units of length. As shown in Figure 1.10, a liter is the volume of a decimeter cubed, that is, 1 L = 1 dm (a dm is 0.1 m, about 4 inches). A milliliter (mL) is the same volume as a centimeter cubed (cm or cc—although this latter abbreviation should no longer be used), and a liter is 1000 cm A kiloliter, or cubic meter (m ), is a common unit of measurement for the volume of air. For example, standards for... 

Meter m 1 Standard metric unit of length (1 m = 1.094 yards)... 

Explain how metric units of volume can be defined in terms of length. 

The SI base unit of length is the meter (m), a distance only slightly longer than a yard. The relations between die English and metric system units that we will use most frequently in this text appear on the back inside cover. We will discuss how to convert English units into metric units, and vice versa, in Section 1.6. 

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