"Rounded", "heaping" and other types of teaspoon(fuls)?

Can you please elaborate what's "rounded" teaspoon, what's "heaped" teaspoon and what other "types" of teaspoons exists as a measures of volume?

And is there any difference between, rounded teaspoon and rounded teaspoon*ful*?

Solution 1:

You have a teaspoon, which measures volume - usually in some ovular, concave measuring device. Let's say you're measuring a teaspoon of something granular, like flour, coffee or sugar.

1 tsp (or 1 level tsp) means that the top of what you're measuring is flat; no sugar goes above the top of the spoon.

1 rounded tsp means you scoop a spoonful of sugar, and let it form a small pile above the top of the spoon. It is inherently less precise than a level teaspoon.

1 heaping tsp means you pretty much try to get as big a pile of sugar onto the spoon as you can, without spilling it. It's a little over a smidgen more than a rounded teaspoon. Helpful hint: Don't try to measure a heaping teaspoon when dealing with liquids.

No, the -ful suffix has no effect on the amount.

Solution 2:

There is also the "scant teaspoon" (example here). It's slightly less than a level teaspoon.

Note that "scant" sometimes means "barely" but in this context it means "not quite."