Task: Class Definition Understanding (ontology: Earth_Environment/OBOE)

Which of the following definitions best describes 'Siemens'?

A. Irradiance, radiant emittance, and radiant exitance are radiometry terms for the power per unit area of electromagnetic radiation at a surface. "Irradiance" is used when the electromagnetic radiation is incident on the surface. "Radiant exitance" or "radiant emittance" is used when the radiation is emerging from the surface. The SI units for all of these quantities are watts per square meter (W/m2) (wikipedia). All of these quantities characterize the total amount of radiation present, at all frequencies. It is also common to consider each frequency in the spectrum separately. When this is done for radiation incident on a surface, it is called spectral irradiance, and has SI units W/m3, or commonly W·m−2·nm−1.
B. Ratio of two quantities as the concept composition (1:100).
C. The the concept is a unit of length equal to 0.1 nanometre.
D. The the concept (symbol: S) is the SI derived unit of electric conductance and electric admittance. Conductance and admittance are the reciprocals of resistance and impedance respectively, hence one the concept is equal to the reciprocal of one ohm, and is sometimes referred to as the mho. It is named after the German inventor and industrialist Ernst Werner von the concept. In English, the term the concept is used both for the singular and plural. The 14th General Conference on Weights and Measures approved the addition of the the concept as an SI derived unit in 1971.

It is a composite unit in OBOE because it is composed of 2 base units, and OBOE-derived units are a single base unit raised to a power.

a the concept is Ampere/volt

Answer: The the concept (symbol: S) is the SI derived unit of electric conductance and electric admittance. Conductance and admittance are the reciprocals of resistance and impedance respectively, hence one the concept is equal to the reciprocal of one ohm, and is sometimes referred to as the mho. It is named after the German inventor and industrialist Ernst Werner von the concept. In English, the term the concept is used both for the singular and plural. The 14th General Conference on Weights and Measures approved the addition of the the concept as an SI derived unit in 1971.

It is a composite unit in OBOE because it is composed of 2 base units, and OBOE-derived units are a single base unit raised to a power.

a the concept is Ampere/volt