Huh? There is no such thing as a physical bitcoin. 1 bitcoin will always be worth 1 bitcoin. To calculate the total bitcoin market cap you multiply the number of circulating bitcoins by the current exchange rate for your preferred currency.
Of course there are: https://www.google.com/search?q=physical+bitcoin&oq=physical...
As to how they relate to crypto, I have no idea, which is why I asked about it.