Rice – Why does the rice smell

Assuming you bought a rice cooker designed by a Japanese company (and apparently even other brands tend to meet that market's expectations), the measurement is 1-gou, slightly more than 180ml, which, by no coincidence, is also the typical measure of a wooden sake, cup, and is closely associated with a historical sake bottle size (approximately 1.8l)

http://en.wikipedia.org/wiki/Masu_(Japanese)

It turns out that this amount, 1 gou of dried rice, neatly corresponded to a typical serving of rice. In practice, most contemporary Japanese eat about 1.5-2 gou per day; 1 gou of dried rice cooks up enough for 2 Japanese adults for one meal if you have several side dishes. There are other measurements that derive from the gou (or perhaps the other way around), such as the koku, which was considered the amount of rice that a single person would consume over the course of a year.

This is one of the human-centric forms of measurement that has survived the metric push; you can find various examples of this in many otherwise metric-converted countries. It turns out some studies show that those metrics often make certain categories of estimation easier for people.

Edited to cover the concern about matching the right amount of water:

It's worth noting that you don't need perfect precision for the amount of water, as long as you cook with the full cycle and not one of the express cooking modes. I can't remember the exact scientific principle behind it, but perhaps something to do with osmotic pressure. Some people use the remarkably effective method of measuring a certain amount of space between the dried rice and the water based on the size of their forefinger segment or thumbnail. It apparently works well for almost any imaginable size of pan (though you can have other problems with a pan too wide to have the rice cover the bottom). (Some types of rice do prefer more water than others, but within a single type, you have a fairly flexible range for the water ratio)

Perfect black rice in a rice cooker - I just cooked 2 cups of black rice, after a single quick rinse using a wire strainer in my Zojirushi rice cooker (fuzzy logic). I used a standard American measuring cup. I added 3 and 3/4 cups of water (vs. the standard straight 2 waters for every one unit of rice - I do this for ALL rice types as I like a fully intact rice kernel with texture remaining - that fluffs and separates as you expect ).

I also added a crumbled organic vegetarian bullion cube (just one) it adds just a little seasoning (still neutral) but I think also provides a little coating on the finished rice that makes it fluff and separate better.

The rice came out perfectly - tender, with just the right kernel bite, fluffed and separated as expected.

One other note, I NEVER use the keep warm function and always pop open the cooker at the first bell signaling cooking is complete, unplug, and I fluff immediately - I leave the cooker open a minute or two to allow steam to escape, then I close it. The rice stays perfectly warm after that for a very long time, long enough for a leisurely meal and warm rice for second helpings.

I can't say enough great things about the Zojirushi rice cooker. It is worth every penny. In addition to rice it cooks wheat berry, rye berry, millet , barley, and many other grains ( including perfect oats) automatically ith zero fuss. I have owned two in 22 years and replaced the first only because the bowl was list and the model was discontinued so no replacement bowel was found.

Many blessings in your rice cooking journey!