The chemical element (symbol Cs) with an atomic number of 55. It is a soft, gold-colored, highly reactive alkali metal.
Used in a Sentence
caesium
Definition, parts of speech, synonyms, and sentence examples for caesium.
Editorial note
A second is the number of vibrations in a rarefied caesium gas.
Examples17
Definitions1
Parts of speech1
Quick take
The chemical element (symbol Cs) with an atomic number of 55. It is a soft, gold-colored, highly reactive alkali metal.
Meaning at a glance
The clearest senses and uses of caesium gathered in one view.
Definitions
Core meanings and parts of speech for caesium.
noun
The chemical element (symbol Cs) with an atomic number of 55. It is a soft, gold-colored, highly reactive alkali metal.
Example sentences
A second is the number of vibrations in a rarefied caesium gas.
A second is the duration of 9,192,631,770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the caesium 133 atom.
A second is defined as the duration of 9,192,631,770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the caesium-133 atom.
Even considering that Caesium ratio of 890:1 between Chernobyl to Fat Man, that's over 29 Chernobyls worth of the stuff flung out.
As in the duration of 551557906200 periods of the radiation corresponding between the two superfine levels of the ground state of the caesium 133 atoms?
Initially the second was defined as 1/86,400th of a day, later narrowed to a mean solar day, but that still wasn't specific enough so they switched it to the current caesium atom definition.
I think the caesium standards are not radioactive but the rubidium standards are slightly radioactive.
More iodine-131, caesium-134 was released as water wapour.
If someone goes past you in a rocket, you'll notice that their Caesium radiation is oscillating slower than yours, so their second will appear to take longer than yours.
We have a definition of the second (in terms of a Caesium atom) and we've agreed on the epoch, so why can't we just leave it be?
Since 1967, the second has been defined as 9,192,631,770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the caesium 133 atom.† The caesium atom is far more consistent than the Earth.
For example, caesium 137 has an estimated biological half life of 70 days [2], while strontium 90, which is taken into bone much like calcium, has an estimated biological half life of 18 years [3].
Quote examples
Please define "dumb" in the context of a system solely guided by one of the most basic, non-emergent process conceivable (caesium oscillator)?
"Since 1967, the second has been defined to be: the duration of 9,192,631,770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the caesium 133 atom" The accuracy of this kind of measurement is so high it's also used (along with the speed of light) as the basis for defining the meter.
Proper noun examples
You take a Caesium-133 atom, look at it's emission spectrum, isolate the ground state radiation and time a number of oscillations.
It uses a Caesium-137 check source and a radiation monitor to generate non-deterministic values.
Caesium-137 [2] has a half-life of 30.17 years and concentrates in soft tissues.
Frequently asked questions
Short answers drawn from the clearest meanings and examples for this word.
How do you use caesium in a sentence?
A second is the number of vibrations in a rarefied caesium gas.
What does caesium mean?
The chemical element (symbol Cs) with an atomic number of 55. It is a soft, gold-colored, highly reactive alkali metal.
What part of speech is caesium?
caesium is commonly used as noun.