Understanding different fields of output of sensors

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http://unix.stackexchange.com – Here's the output of sensors command: thinkpad-isa-0000 Adapter: ISA adapter fan1: 3414 RPM coretemp-isa-0000 Adapter: ISA adapter Physical id 0: +50.0°C (high = +86.0°C, crit = +100.0°C) Core 0: +47.0°C (high = +86.0°C, crit = +100.0°C) Core 1: +49.0°C (high = +86.0°C, crit = +100.0°C) acpitz-virtual-0 Adapter: Virtual device temp1: +49.0°C (crit = +99.0°C) What is the Physical id 0 device, and how does the virtual device works here? Where does the data come from? (HowTos)