How small can the diameter of the stainless steel capillary be?

If it is used on the refrigerator capillary, its inner diameter is generally between 0.18-1.2mm, and its outer diameter is about 0.8-1.8. If it is used on the freezer, its inner diameter is generally between 0.48-1.45mm, and its outer diameter is about 0.8-2.45, and it is used on the air conditioner and the freezer. Such as the human body, capillary diameter is generally 6-8 μm, the blood vessels are larger,

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