1işıq ili=10 trilyon km<br /> 1düym=25.4mm<br /> 1batman=8kq<br /> 1dirsək=50sm<br /> 1xalvav=400kq<br /> 1pud=16kq<br /> 1arşın=71.2 sm<br /> 1qulac=177sm<br /> 1ağac=6-7km