caesium

«caesium» in Mova's school dictionary: a soft, silvery-gold metal, a chemical element (symbol… — its meaning for a pupil, its sense in the lessons and examples.

part of speech

noun (caesium — uncountable)

meaning for a pupil

1) Caesium is a soft, silvery-gold metal, a chemical element (symbol Cs) that reacts violently with water. tree →

2) Caesium is used in atomic clocks, the most accurate clocks there are. tree →

sense in the lessons

In science lessons on elements and the periodic table (group 1 alkali metals with sodium and potassium); in maths and science, time: the second is defined using caesium atoms; in news about nuclear accidents, radioactive caesium.

examples

• Caesium explodes if you drop it into water. tree →
• Atomic clocks use caesium to keep perfect time. tree →
• Caesium's symbol is Cs. tree →
• Caesium melts on a very hot day. tree →
• Radioactive caesium spread after the nuclear accident. tree →

note

UK spelling «caesium»; US spelling «cesium». Uncountable. Say it «SEE-zee-um». Safety: alkali metals are dangerous and only handled by trained scientists.

Trees and pragmatics

Every meaning and example of «caesium» parsed by Mova, each sentence with its dependency tree and frames.