A square shape (area) has two dimensions (e.g., length and width), while a cube (volume) has three dimensions (e.g., length, width, and height). Some measurements have one dimension, for example length. For example, changing the magnitude of a SI quantity or converting between SI and non-SI units.
Pressure and Gas Flow Conversion Informationĭimensional analysis is a technique used to convert measurements. 
NIST HB 133 Appendix E (Current Ed.) provides unit conversion factor tables for the benefit of those requiring an reference when checking the net contents of packaged goods.customary units, including notes on British measurement units.
NIST HB 44 – Appendix C (Current Ed.) provides several convenient conversion factor tables for length, area, volume (dry and liquid measure), and mass using SI (metric system) and U.S. 
NIST SP 1038 (Current Ed.) lists the units of the International System of Units (SI), or metric system, recommended for use in trade and commerce and other general uses by the National Institute of Standards and Technology. NIST SP 811 – Appendix B (Current Ed.) provides guidance on the use of conversion factors which are expressed using scientific notation (listed both alphabetically and by topic areas) and rules for rounding numbers and converted numerical values of quantities. Common conversion factors are also listed (Section 5). This multi-step process is presented in NIST SP 1038 - 2006 (Section 4.4), including a rounding procedure for technical documents, specifications, and other applications such packaged goods in the commercial marketplace and temperature. Unit conversion is a multi-step process that involves multiplication or division by a numerical factor, selection of the correct number of significant digits, and rounding. The National Conference on Weights and Measures (NCWM). Weights & Measures Resources Expand or Collapse. Electric Vehicle Fueling and Submetering. National Working Groups Expand or Collapse Resources for Continuing Education and Training. Legal Metrology Devices Expand or Collapse. Laws and Regulations Expand or Collapse. Laboratory Metrology Expand or Collapse. International Legal Metrology Expand or Collapse.
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