ug/ft2 stands for?

ug/ft2 stands for?

• A. Microgram per foot
• B. Microgram per square foot
• C. Microgram per cubic foot
• D. Microgram per inch

Answer: (B)

This notation expresses a mass per area. The “ug” part means microgram, a unit of mass, and “ft2” means square foot, an area unit. So micrograms per square foot is the amount of contaminant on each square foot of a surface, a common way to report surface wipe results for lead. The other options don’t fit because: - Microgram per foot would be micrograms per linear foot, not per area. - Microgram per cubic foot would be a mass per volume, not per surface area (used for air concentrations). - Microgram per inch would be micrograms per linear inch, again a length-based measure, not an area-based one. So ug/ft2 stands for microgram per square foot.

This notation expresses a mass per area. The “ug” part means microgram, a unit of mass, and “ft2” means square foot, an area unit. So micrograms per square foot is the amount of contaminant on each square foot of a surface, a common way to report surface wipe results for lead.

The other options don’t fit because:

• Microgram per foot would be micrograms per linear foot, not per area.

• Microgram per cubic foot would be a mass per volume, not per surface area (used for air concentrations).

• Microgram per inch would be micrograms per linear inch, again a length-based measure, not an area-based one.

So ug/ft2 stands for microgram per square foot.