One can purchase 20 black crayons on Amazon by buying the black crayons in bulk as opposed to by the box which contains several different colors. One can also buy black crayons at Office Specialties.
why are raindrops different sizes?
You could melt different types of crayons to see which color melts faster. that would be categorized as chemistry
they are made with different binders
The different use of binders.
Cells are different shapes and sizes because they have different functions. The functions dictate the shapes and sizes.
crayons = Malkreide (sing.) crayons = Farbkreide (sing.) crayons = Buntstifte (pl.) crayons = Wachsstifte (pl.)
crayons - les crayons which means pencils. If coloured, they are crayons de couleur.
different colored crayons
They are different sizes to aid the blind/visually impaired
A box of a dozen (12) average crayons weighs about 2.11644oz but, there are different size 'boxes' of crayons. The ones you get at a restaurant may have 4 or 5 crayons, then I think there are ones with 15 or 16. Then there are 21, 48, 64, 96, and 120 count boxes, to name a few.
The earliest of crayons didn't have uniform tips like they do today. Most of them were hand carved or even when they were machine carved, the didn't have the flat tip they do today; they went to a very fine point. Another change you don't see is that many assortment boxes contained a brass or metal crayon holder so you wouldn't break your crayons while coloring with them. Crayons were generally very small in early years. They thought that small children had small hands and therefore needed small crayons whereas they've since realized that larger oversized crayons make it easier for small children to control. The sizes have changed over the years. The most common sizes found in the late 1800s and pre-1920 era were 28, 14 and 7 and none of those sizes are now available. They've switched to 8,16,24,48,64.