caesium

/'si:zjəm/

Thân thiện

A scientist carefully handles a small vial of liquid caesium in a laboratory.

Definition

1. Noun:
   • A chemical element: Caesium is a soft, silver-white, ductile metallic element that is liquid at room temperature. It is the most electropositive and alkaline metal.

Usage

• Caesium is primarily used in scientific and industrial contexts. It is not a word used in everyday conversation.
• It is used to refer specifically to the chemical element with the atomic number 55 and symbol Cs.

Examples

• Noun:
  • The laboratory stored a small sample of pure caesium under oil.
  • Caesium-133 is used in atomic clocks because of its consistent vibration frequency.

Advanced Usage

• "Caesium clock": An extremely precise timekeeping device that uses the microwave spectral line of caesium-133 atoms as its reference.
  • The accuracy of global positioning systems relies on signals from caesium clocks.
• "Caesium standard": The international standard definition of the second is based on the properties of the caesium atom.

Variants and Related Words

• Cesium (n): The American English spelling of "caesium". Both spellings refer to the same element.
  • The periodic table lists the element as cesium (Cs).
• Caesiate (v, rare): To treat or combine with caesium. This is a highly technical term.
• Caesium hydroxide (n): A strong base (chemical compound) formed from caesium.
  • Caesium hydroxide is one of the strongest alkaline hydroxides.

Synonyms

• Element 55: A synonym referring to its atomic number.
• Cs: The chemical symbol for caesium.

Related Phrases and Compounds

• Caesium vapour: Caesium in its gaseous state, often used in certain types of magnetometers and other scientific instruments.
• Caesium beam: A stream of caesium atoms, fundamental to the operation of atomic clocks.
• Alkali metal: Caesium belongs to this group of highly reactive metals in the periodic table, which also includes lithium, sodium, and potassium.

Học thuật

Noun

1. a soft silver-white ductile metallic element (liquid at normal temperatures); the most electropositive and alkaline metal

Từ đồng nghĩa

• cesium
• Cs
• atomic number 55