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Chapter 1: Problem 66

Fill in each blank. The basic metric unit of mass is _______. Its abbreviation is_____.

Short Answer

Expert verified
Kilogram; kg.

Step by step solution

01

Identify the Metric Unit

In the metric system, the basic unit of mass is known as the kilogram. It is used universally in countries that follow the metric system for measuring mass.
02

Find the Abbreviation

The abbreviation for kilogram is 'kg'. It is derived from the prefix 'kilo-', indicating a thousand units of grams as the base unit, even though the gram itself is not often used as the standard unit for larger measurements.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Mass Measurement
Mass measurement refers to the determination of the amount of matter in an object, typically measured in units such as grams or kilograms. It helps us understand how much 'stuff' is in an object, differing slightly from weight鈥攚hich refers to the force exerted by gravity on an object鈥檚 mass. Mass remains consistent regardless of location, while weight can change depending on gravity.
For instance, your mass on Earth would be the same on the Moon, but your weight would differ due to the Moon鈥檚 weaker gravitational pull. This fundamental difference highlights the importance of having a standard unit of mass measurement, which the metric system provides worldwide.
  • Mass tells us the amount of matter in a body.
  • It is a scalar quantity; it does not change with location.
  • Commonly expressed in the metric system using kilograms and grams.
Kilogram
The kilogram is the base unit of mass in the metric system. It is defined by the International System of Units (SI) as the mass of a specific platinum-iridium alloy cylinder stored at the International Bureau of Weights and Measures in France.
The kilogram is fundamental for everyday mass measurements worldwide. It simplifies calculations in science and engineering as it is synchronized with other SI units.
  • A kilogram equals 1,000 grams.
  • Abbreviated as 'kg'.
  • The only SI base unit still defined by a physical object until recently.
In 2019, a new definition based on the Planck constant, a fundamental physical constant, was adopted. This change ensures universality and precision in measurements.
Metric Units
Metric units form a standardized system used globally for measuring various quantities like length, mass, and volume. Originating in France during the 18th century, the system was designed to simplify and unify diverse measurement systems previously used.
Mass, specifically, is measured in units such as grams and kilograms within this system. These units are scalable, making them practical for diverse purposes, such as:
  • Scientific research, where precise measurement is crucial.
  • Everyday use; shopping, cooking, and trade.
  • Education, ensuring a uniform understanding among students worldwide.
The metric system makes it easy to convert between units: 1,000 grams make up a kilogram; similarly, 1,000 milligrams constitute a gram. This simplicity enhances efficiency in all aspects of measurement.

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Most popular questions from this chapter

Use the rules for subtraction of measurements to subtract each second measurement from the first. $$ \begin{gathered} 45.585 \mathrm{~g} \\ 4.6 \mathrm{~g} \\ \hline \end{gathered} $$

Use the rules for division of measurements to divide. $$ 185 \mathrm{mi} \div 4.5 \mathrm{~h} $$

Determine the accuracy (the number of significant digits) of each measurement. \(10.30 \mathrm{~cm}\)

Use the rules for division of measurements to divide. $$ \frac{8800 \mathrm{mi}}{8.5 \mathrm{~h}} $$

Determine the precision of each measurement. \(70.00 \mathrm{~m}^{2}\)
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