Englishfor English speakers
Langmuir
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noun
United States chemist who studied surface chemistry and developed the gas-filled tungsten lamp and worked on high temperature electrical discharges (1881-1957)
wave
Noun
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A wave is the motion of water up and down.
wave
Verb
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To move from side to side again and again.
The flag waved in the wind.
collapse
Verb
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Something collapses when all its parts fall down loosely. A building or a bridge collapses when it breaks and all its parts fall down. A person collapses when they are tired and they fall into a chair or onto a bed and are too tired to get up.
He was so tired, he just collapsed onto that chair.
The bridge collapsed, but no one was hurt.
collapse
Noun
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The act of collapsing.
The collapse of the bridge means we can't go over the river any longer.