Science Activity : Zesty Meter

Why do most people grate orange or lemon skin (zest) rather than putting the juice in their cooking?
Lemon zest has a more intense citrus flavor than the juice inside. The citrus flavor comes from the limonene in small sacs in the peel. Please be careful not to grate the white part underneath. it will give us the icky taste. there are two types of limonene, 

l-limonene smells piney and turpentine like

d-limonene has a pleasing orange scent

What do you think will happen if we pinch a lemon peel next to a lit candle?

Why does the candle fire up more when we pinch the lemon peel next to it?

Limonene is a type of oil. Its like putting petrol in a bonfire, it will fire up more

Why does lime zest taste more sour than lemon and orange but has the least zest?
Between lime, orange and lemon, which has the most zest and makes the flame fire up most?
The common answer would be lime because it is the most sour between the three. But the limonene or oil sacs on a much thicker peel thus contains more limonene. The real contest is between lemon and orange. So far, LEMON would fire up the most.

p/s: oh yeah, I made garbage enzyme with the orange, lime and lemon peel leftovers, wanna check it out? Click here and here for the weekly update

reference
greenlivingtips.com
whatscookingamerica.net