Caesium
/ˈsiːziəm/noun
A soft, silvery-gold metal that is a chemical element with the symbol Cs and atomic number 55.
Caesium is used in atomic clocks because of its precise vibrations.
Often appears as...
- caesium chloride
- caesium atomic clock
Usage tips
Technical
noun
A radioactive isotope of caesium, specifically caesium-137, produced by nuclear fission.
After the Chernobyl disaster, high levels of caesium-137 were found in the surrounding areas.
Often appears as...
- caesium-137
- radioactive caesium
Usage tips
Technical
noun
A bright blue line in the spectrum of the light from heated caesium.
The distinct caesium line in the spectrum helps in its identification.
Often appears as...
- caesium line
- caesium spectrum
Usage tips
Technical
noun
A soft, silvery-gold metal that is a chemical element with the symbol Cs and atomic number 55.
Caesium is used in atomic clocks because of its precise vibrations.
Often appears as...
- caesium chloride
- caesium atomic clock
Usage tips
Technical
noun
A radioactive isotope of caesium, specifically caesium-137, produced by nuclear fission.
After the Chernobyl disaster, high levels of caesium-137 were found in the surrounding areas.
Often appears as...
- caesium-137
- radioactive caesium
Usage tips
Technical
noun
A bright blue line in the spectrum of the light from heated caesium.
The distinct caesium line in the spectrum helps in its identification.
Often appears as...
- caesium line
- caesium spectrum
Usage tips
Technical
Definition 1 of 3
Pro Tip 1/3Scientific Use
Caesium is commonly mentioned in scientific contexts, especially regarding its uses in technology.
The laboratory was equipped with a caesium-based spectroscopy device.
Pro Tip 2/3Pronunciation
Pronounced as 'see-zee-um', it might be confused with 'cesium', which is the American spelling.
The article on atomic clocks clarified the vibrational frequency of caesium.
Pro Tip 3/3Element Appearance
When learning about caesium, remember its notable softness and gold-silver color.
He marveled at the caesium's shimmering appearance under the lab lights.
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