Light up or Light?

[Iloveenglish]

What is the difference between them?

Are the sentences ok:

'If you put a lamp under a beer bottle, the liquid will light up.'

''The elevator indicator will light up if you push the button.''

[Milanya]

light up

if part of a machine lights up, it begins to shine brightly
When you turn on the computer, the screen lights up and it's ready to use.
An arrow lit up on the car dashboard showing that the oil was low.

(from Cambridge International Dictionary of Phrasal Verbs)
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con·text - The part of a text or statement that surrounds a particular word or passage and determines its meaning.

[Iloveenglish]

Thank you, m'am.

[Iloveenglish]

You know I google things first then I ask them here. Please don't think I don't bother to look up first.

[Milanya]

Actually, I do not Google things, I check with trusted dictionaries.
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con·text - The part of a text or statement that surrounds a particular word or passage and determines its meaning.