Difference betwen Null item,Blank item ,item is zero and empty item

Please describe the difference betwen :
null item
empty item
blank item
and zero item
And how can we test each one?
How to test if the value of an item say Px_y is null or
blank
empty
zero
Regards

Please describe the difference betwen :
null item
empty item
blank item
and zero item
And how can we test each one?
How to test if the value of an item say Px_y is null or
blank
empty
zero
Regards

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