In the United States, building plans are specified in feet, or feet and inches. Elsewhere it would be meters.
Density is measured in units of mass per unit volume, such as grams/cubic cm, or lbs/gallon. As for the uncertainty, that depends on how accurate your equipment is and how careful you have been in ensuring that you have taken the measurements accurately.
The gauge system doesn't directly correlate to millimeters; however, in the body jewelry industry, a 14g piercing is usually around 1.6mm in diameter. It is always recommended to consult with a professional piercer for accurate measurements and to ensure proper sizing for your piercing.
Atomic mass
I believe the answer to this is "area." It is fairly vague and I would need the context of the question to be sure.
The proportion of dissolved substances in seawater is typically expressed in parts per thousand (ppt) or salinity, which is the concentration of dissolved salts in seawater.
Here in Australia its usually millimeters, regardless on the size of the piece.
The error in a set of observations is usually expressed in terms of the Standard Deviation of the measurement set. This implies that for a given plotted point, you have several measurements.
Usually, when observations and measurements are aggregated, these are called DATA.
Material men are people who supply materials usually in building trades. This is commonly used in the construction industry.
Usually, when observations and measurements are aggregated, these are called DATA.
It is expressed as a percentage (fraction of 100%).
Liquid measure in scientific experiments is typically expressed in milliliters (mL), liters (L), or microliters (μL), depending on the volume of the liquid being measured. These measurements help ensure accuracy and consistency in conducting experiments.
Plat refers to the shape and measurements of the piece of land you are placing the footprint of your house on. Plat maps show this information, usually within a neighborhood.
A rational number, other than an integer, is expressed as a fraction.
error
mbps
Assuming you mean "phase", it is usually expressed in angular units - degrees, or radians.