This is one of the apparatus to be used in scientific laboratories to demonstrate that sound needs a medium to travel.
Turn on the bell placed in this vacuumed jar.
Now during this experiment the sound that will be produced in this jar is not audible to our ears, as the sound waves can’t travel in a vacuum state and they need a material medium for its propagation.
It can also place on pump plates to perform experiments with diameter at least 15cm.
Excellent demonstration tool for science classrooms.
EDTA tubes are used for determinations blood for haematology, immuno-haematology or for the molecular biological identification of viruses, parasites and bacteria after centrifugation and plasma for clinical chemistry.
The additive potassium EDTA (Ethylene-diamine Tetra Acetic Acid) contained in the tube interferes with calcium.
