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

Liquid Drop From Tube

Potion 

A hand holding a fuel pump with a landscape in the background and two drops dripping from the pump.

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.