Depending on the baby's age and appetite the bottles all contain different amounts of liquid, and as it happens most are different types of bottles anyway. (skepticalob.com)
You will need to play about with how much turps to have on the brush, because all brushes hold different amounts of liquid. (arttutor.com)
Flour absorbs different amounts of liquid depending on the weather (how humid) or its freshness. (joyofbaking.com)