Thus, some studies show that a six - ounce cup of regular coffee may contain 100 or more milligrams of caffeine, whereas a single shot of espresso may contain somewhat less.
इसमें संदेह नहीं कि डबल ऎस्प्रॆसो में सिंगल ऎस्प्रॆसो से ज़्यादा कैफ़ीन होगी ।