Một ống Torricelli được dùng làm áp kế khí quyển với chiều dài ống nằm ngoài chậu thủy ngân là $ \ell =800\,mm. $ Vì có ít bọt khí đã lọt vào phần chân không của ống nên áp kế đã chỉ sai. Khi áp suất khí quyển là 760 mmHg thì áp kế khí $ h{{ }_{1}}=740\,mm. $ Hỏi khi áp kế chỉ $ h=730\,mm $ thì áp suất thực của khí quyển là

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