I found that capillary tubes in refrigeration system are tubes with very small diameter and very long length. Pressure drops down suddenly due to very small diameter of the capillary and length. The smaller the diameter and longer the length of the capillary, more the drop in pressure.
I am not from mechanical stream, I am just trying to learn.
If capillary tube inlet is $1$ atm pressure, can we achieve dropping the pressure to the perfect vacuum??
If anything wrong correct me??