This is the 858th most frequent Vietnamese word.
lý
"Reason" or "principle."
In this sentence, 'lý' is part of the term 'vật lý', which means 'physics'. It refers to the scientific discipline.
Tôi thích học vật lý vì nó rất thú vị.
I like studying physics because it's very interesting.
Here, 'lý' is used in the phrase 'có lý', meaning 'reasonable', indicating logical behavior.
Anh ấy luôn cư xử có lý với mọi người.
He always acts reasonably with everyone.
In this sentence, 'lý' is part of the term 'lý do', meaning 'reason', denoting the cause or motivation for an action.