A droplet of liquid falling from a tilted glass test tube.

Liquid Drop From Tube

A test tube or science beaker with a round base containing a bubbly liquid.

Science Flask With Round Base And Bubbles

A test tube that's three-quarters filled with liquid.

A test tube with measurements and liquid inside.

A lab test tube with liquid and measuring lines.

A test or lab tube with three liquid portions.

A test tube with a round base containing bubbly liquid.