A baguette is "a long thin loaf of French bread"that is commonly made from basic lean dough (the dough, though not the shape, is defined by French law). It is distinguishable by its length, crisp crust, and slits that enable the proper expansion of gases.
A standard baguette has a diameter of about 5 or 6 cm (2 or 2⅓") and a usual length of about 60 cm (24"), although a baguette can be up to a meter (39") long. A Parisian baguette typically weighs 250 grams (8.8 oz) but 200-gram (7 oz) baguettes are also very common in France; the weight is not legally regulated and varies by region.
credit : http://en.wikipedia.org/wiki/Baguette