Question

in a certain system of unit unit of length 1 millimetre unit of mass is 1 gram and unit of time is 1 microsecond calculate the value of unit of power in the terms of water

Answer 1

Answer:

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 Système International d'Unités. The SI system has seven base units from which all other units are derived. Table 1.4 lists these base units and their symbols. In this chapter we will consider the base units for length, mass, and temperature.

Prefixes are used to indicate decimal fractions or multiples of various units. For example, the prefix milli- represents a fraction of a unit: A milligram (mg) is gram (g), a millimeter (mm) is meter (m), and so forth. Table 1.5 presents the prefixes commonly encountered in chemistry. In using the SI system and in working problems throughout this text, you must be comfortable using exponential notation. If you are unfamiliar with exponential notation or want to review it, refer to Appendix A.1.

Although non-SI units are being phased out, there are still some that are commonly used by scientists. Whenever we first encounter a non-SI unit in the text, the proper SI unit will also be given.

Length and Mass

The SI base unit of length is the meter (m), a distance only slightly longer than a yard. The relations between the 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.

Mass* is a measure of the amount of material in an object. The SI base unit of mass is the kilogram (kg), which is equal to about 2.2 pounds (lb). This base unit is unusual because it uses a prefix, kilo-, instead of the word gram alone. We obtain other units for mass by adding prefixes to the word gram.