css3: change font size ratio

i'm just trying out the new font-face feature in css3 for implementing own ttf/otf fonts. my question: is it possible to change the default font size ratio? example: i'm using tahoma with开发者_开发问答 9pt as default font and want to implement ownfont.ttf - the problem: if the browser supports @font-face, the ownfont.ttf with 9pt is much smaller than tahoma with 9pt. is there a way to increase its size ratio?

Have a look at the css3 property font-size-adjust.