At surface level, a diving bell has an air space of 4.25 m3. When used during an exploration, it is submerged 60.0 metres. At that point, what is the volume of the air space? Assume that the mean density of seawater is 1.025 g·cm−3, while the temperature is the same as on the surface.

volume of the airspace=0.605m^3

Explanation:

Patm = 10^5 N/m^2

Depth= 60 metres

Pressure at the depth = ?

Density = 1.025 g/cm3 = 1025 kg/m3

P = Patm + hσg

P = 10^5 + 60*1025*9.8

P = 702700 N/m^2

P = 7.027 atm

Since the temperature is constant, Boyle’s law holds

P1V1 = P2V2

P1 = 1 atm  

P1, initial pressure of the bell(atm pressure) = 1 atm

The initial volume of the airspace, V1 = 4.25 m^3

Final pressure at the depth = 7.027 atm

Applying the Boyle’s lay

1*4.25 = 7.027 * V2

V2 = 4.25/7.027

V2 = 0.605m^3

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).