In physics numericals, if the units of your Universal Gas Constant 'R' do not match the units of pressure and volume given, your final answer will be wrong, and the teacher will cut the mark. This is strict, like my father checking the shop accounts. But I have seen that sometimes, if the calculation method is perfectly shown, a lenient teacher may give a half-mark, hoping you learn. This reminds me of when the old men on my bench gently correct a story's detail but still cherish the telling.
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