#### Archimedes Principle

D
```"""
Calculates buoyant force on object submerged within static fluid.
Discovered by greek mathematician, Archimedes. The principle is named after him.

Equation for calculating buoyant force:
Fb = ρ * V * g

Source:
- https://en.wikipedia.org/wiki/Archimedes%27_principle
"""

# Acceleration Constant on Earth (unit m/s^2)
g = 9.80665

def archimedes_principle(
fluid_density: float, volume: float, gravity: float = g
) -> float:
"""
Args:
fluid_density: density of fluid (kg/m^3)
volume: volume of object / liquid being displaced by object
gravity: Acceleration from gravity. Gravitational force on system,
Default is Earth Gravity
returns:
buoyant force on object in Newtons

>>> archimedes_principle(fluid_density=997, volume=0.5, gravity=9.8)
4885.3
>>> archimedes_principle(fluid_density=997, volume=0.7)
6844.061035
"""

if fluid_density <= 0:
raise ValueError("Impossible fluid density")
if volume < 0:
raise ValueError("Impossible Object volume")
if gravity <= 0:
raise ValueError("Impossible Gravity")

return fluid_density * gravity * volume

if __name__ == "__main__":
import doctest

# run doctest
doctest.testmod()
```  