Responsive Web Design and Smartphones font size


I have recently converted my website, to responsive web design, however I can't understand how to get the font size right on Smartphones.

For example, when I open the website with my Google Nexus, I see a very small text. If I set it to 1em, which I guess would be 16px, it is really small. So now I have changed it to 1.4em with:

@media screen and (max-width: 800px) {
   body{font-size: 1.4em}

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