## 4.3. Units of measurements

Unlike most abbreviations, standard unit abbreviations are not followed by a period in Czech texts. In PDT 2.0, they often use a lemma equal to the abbreviated form, referring to the unabbreviated lemma via ```: `V-1`volt_:B`. Unfortunately, this approach is not taken consistently, so for instance Celsius uses directly the target lemma instead of a reference to it: `Celsius_:B`.

Units called after male persons (V - volt, A - ampér, etc.), have the masculine inanimate gender. However, units using degrees (C, F) have masculine animate gender, because the word stupeň (degree) is always present (even if omitted in the written text). Absolute temperature uses the unit called Kelvin (K), not degree of Kelvin. Therefore the unit has the masculine inanimate gender. The author may use it errorneously as degrees but we cannot correct them because the gender of a noun is implied by its lemma, not its context.

Table 4.4. Examples of units

Expression

Annotation of the unit abbreviation

Ráno byly 3°C.

`Celsius_:B / NNMXX-----A---8`

Ráno byly 3 C. (read as Ráno byly tři stupně Celsia.)

`Celsius_:B / NNMXX-----A---8`

teplota 5000 K (read as teplota pět tisíc kelvinů)

`K-1`kelvin_:B / NNIXX-----A---8`

If the C character is preceded by some character trying to look like the degree symbol ° (eg. -C, o C, O C), it should be marked as an error. The form attribute should be "°", while the origf attribute retains the original character.[2] The lemma shall be `stupeň_:B`, the tag `NNIXX-----A---8`.

[2] On Czech keyboards usually Shift+<key-on-the-left-from-1>, followed by Space. On any keyboard under MS Windows: Alt+0176.