In the case of a liquid sample, pouring a shallow amount over the surface of the crystal is sufficient.
This is the technique of flash photolysis, and again it can be applied to gaseous or to liquid samples.
This page discusses various techniques currently used to quantify viruses in liquid samples.
How to check the salinity of a liquid sample?
Kits using copper-magnesium cells activated by water or the liquid sample itself are also in development.
On the other side of that surface is our liquid sample.
In the field of science, a liquid sample is sometimes called an aliquot.
Impact testing may also be performed with liquid samples confined in special cells.
It is used to concentrate and reduce the volume of liquid samples.
They may also be used to take liquid samples from the body, for example taking blood from a vein in venipuncture.