a bitcoin (1btc)  is an allotment of 100,000,000 units of sats

inside a transaction at raw data level converted to human readable numbers 1btc is not in a tx as 1btc

its actually in the form of 100,000,000

everything in bitcoin network and transactions is measured in sat numbers then divided to its btc representations

so then looking at a tx of 1btc. in binary which is the true real world state it sits physically on a hard drive

101111101011110000100000000

so 1btc physically looks like  101111101011110000100000000