We will be dealing with two types of quantities in this book. Some quantities are fully specified only by a number and a unit, such as a quart of milk or a pound of potatoes. Such a quantity consisting only of magnitude is called a scalar quantity. Other measurements have meaning only if direction is specified along with the magnitude. For example, telling a stranger that a gas station is 1 mi away will not help him unless you specify the direction also. A quantity that has both magnitude and direction and obeys certain algebraic laws is called a vector quantity and will be indicated in this book by boldface type.
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