But when such cells were grown in a laboratory dish, they adhered to the flat surface of the liquid medium they were grown on, spreading out in a thin layer. (protomag.com)
Use a spoon to skim any fat from the top of the surface of the liquid in the pot. (thecrumbykitchen.com)
First, let's clarify what we mean by simmering: A bubble breaks the surface of the liquid every second or two. (cookinglight.com)