According to avogadro's law, the volume of a gas is inversely related to the number of moles at constant temperature and pressure the volume of a gas is inversely related to the number of moles at standard temperature and pressure the volume of a gas depends only on the temperature and pressure the volume of a gas depends only on the number of moles in the sample the volume of a gas is directly related to the number of moles at constant temperature and pressure

Here by ideal gas equation we have

PV = nRT

so here if

So we can say pressure , volume and temperature ratio is same then number of moles must be same

for

So number of moles is directly proportional to product of volume and pressure of the gas and inversely proportional to temperature of the gas

most voltage drop calculators want the distance between the source and destination. then internally, they double it so both the source and return wires are calculated. but you need to know which distance the calculator uses so you're not half of what you should be or double what you should be.

most circuit breakers will not take a #6 directly, so the electrician will have to splice on a smaller pigtail. you also have to upsize the grounding wire when you upsized the ungrounded (hot) wire (see note in 250.122). this will preclude using most cable assemblies, as a cable with #6 copper will most likely only have a #10 grounding conductor. you need a #6 grounding conductor if the circuit is 20a. a #8 cable is no better, as it will have a #10 grounding conductor too. but most 20a breakers will take a #8 directly.

in your related post, you didn't say what type of load this is. if it is a light or heater, voltage drop won't be a big issue. if this is a motor, the current needs are huge at startup and the voltage drop can pose a problem. if this is a motor, knowing if the motor is under much load during startup will answer the voltage drop effect (a saw is easier to start than a compressor).