Copyright Goodheart-Willcox Co., Inc. May not be reproduced or posted to a publicly accessible website. 74 Math for HVACR Prefi used in SI measurement are the same throughout the system, whether fixes used for linear measurement, weight, or volume. Goodheart-Willcox Publisher Common SI Multiples for Meter (m) Multiple 1/100 meter 1/10 meter 1 meter 10 meters 100 meters 1/1000 meter 1000 meters Name centimeter decimeter meter dekameter hectometer millimeter kilometer Symbol km cm dm m dam hm mm 5.2.3 Linear Measurement in the Industry In the mechanical trades, estimating pipe length, fi ttings, equipment, and the like is known as ”doing take-offs.” When an estimator does take-offs, it is for the purpose of determining the approximate cost of the job before bidding on the job or for determining what materials should be purchased for a job that has already been awarded to the contractor. When doing take-offs, accuracy is important, as inaccurate take-offs can result in lost business, or worse, lost profit.fi 5.3 Capacity Measurement The amount of material a container can hold is called its capacity. The term volume is sometimes used as well and may be interchanged with the term capacity in common y practice. However, volume is also used to describe the amount of space a three- dimensional object occupies. That term will be covered in another chapter of this text. 5.3.1 US Customary Capacity measurement in the US Customary system is based on the fluid ounce (fl .oz.). Cups, pints, quarts, and gallons are multiples of ounces, as shown. 8 oz 16 oz 2 cups 32 oz 2 pints 128 oz 4 quarts Capacity Measurements in US Customary Units Ounce (oz) Cup (c) Pint (p) Quart (qt) Gallon (gal) Goodheart-Willcox Publisher