Cm
Học thuậtThân thiện
Definition
- Noun:
- Centimetre (cm): A unit of length in the metric system equal to one hundredth (1/100) of a metre.
- Curium (Cm): A synthetic, radioactive metallic chemical element.
Usage
- As a unit of measurement (centimetre): Used to express small lengths or distances. It is a standard unit in science, engineering, and daily life in most countries.
- The ruler is 30 cm long.
- The tumour measured 2 cm in diameter.
- As a chemical symbol (curium): Used primarily in scientific contexts, such as chemistry, physics, and nuclear technology. It is not used in everyday language.
- The isotope Cm-244 was used in the experiment.
- Curium (Cm) is an actinide element.
Advanced Usage
- The symbol cm is always written in lowercase letters.
- In scientific writing, a space is typically placed between the number and the unit (e.g., ), though it is sometimes omitted in informal contexts.
- When meaning , it is often used in combination with other metric prefixes to form units like square centimetre (cm²) or cubic centimetre (cm³ or cc).
Variants and Related Words
- Centimetre (n): The full word for the unit of length.
- Curium (n): The full name of the chemical element.
- Millimetre (mm) (n): A smaller unit of length (1/1000 of a metre).
- Metre (m) (n): The base unit of length in the metric system.
Synonyms
- For : There is no direct synonym, but it can be described as or .
- For : There is no synonym; it is a specific element symbol.
Notes on Different Meanings
- The meaning of cm is entirely dependent on context.
- In a measurement context (e.g., sewing, construction, height), it always means centimetre.
- In a chemical or nuclear physics context, it always means the element curium.
- These two meanings are homographs (written the same) but refer to completely different concepts.
Noun
- a radioactive transuranic metallic element; produced by bombarding plutonium with helium nuclei
- a metric unit of length equal to one hundredth of a meter