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How is a unit of 1000 board feet expressed?

  1. MBF

  2. BF

  3. CBM

  4. GBF

The correct answer is: MBF

A unit of 1000 board feet is expressed as MBF, which stands for "thousand board feet." This term is commonly used in the lumber industry to quantify volume in terms of board footage. Board footage is a measurement of lumber volume that is calculated as the thickness (in inches) multiplied by the width (in inches) multiplied by the length (in feet) of a board, then divided by 144 to convert it into board feet. Using MBF allows for easier communication and efficiency in transactions involving larger quantities of lumber, as it simplifies the figures involved. The other options refer to different measurements or units not directly related to the quantity of board footage. For instance, BF refers to one board foot, CBM stands for cubic meters, and GBF is not a standard recognized term in this context. Thus, MBF is the correct and most appropriate unit for expressing 1000 board feet.