diff --git a/physics/speed_of_sound.py b/physics/speed_of_sound.py
new file mode 100644
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+++ b/physics/speed_of_sound.py
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+"""
+Title : Calculating the speed of sound
+
+Description :
+    The speed of sound (c) is the speed that a sound wave travels
+    per unit time (m/s). During propagation, the sound wave propagates
+    through an elastic medium. Its SI unit is meter per second (m/s).
+
+    Only longitudinal waves can propagate in liquids and gas other then
+    solid where they also travel in  transverse wave. The following Algo-
+    rithem calculates the speed of sound in fluid depanding on the bulk
+    module and the density of the fluid.
+
+    Equation for calculating speed od sound in fluid:
+    c_fluid = (K_s*p)**0.5
+
+    c_fluid: speed of sound in fluid
+    K_s: isentropic bulk modulus
+    p: density of fluid
+
+
+
+Source : https://en.wikipedia.org/wiki/Speed_of_sound
+"""
+
+
+def speed_of_sound_in_a_fluid(density: float, bulk_modulus: float) -> float:
+    """
+    This method calculates the speed of sound in fluid -
+    This is calculated from the other two provided values
+    Examples:
+    Example 1 --> Water 20°C: bulk_moduls= 2.15MPa, density=998kg/m³
+    Example 2 --> Murcery 20°: bulk_moduls= 28.5MPa, density=13600kg/m³
+
+    >>> speed_of_sound_in_a_fluid(bulk_modulus=2.15*10**9, density=998)
+    1467.7563207952705
+    >>> speed_of_sound_in_a_fluid(bulk_modulus=28.5*10**9, density=13600)
+    1447.614670861731
+    """
+
+    if density <= 0:
+        raise ValueError("Impossible fluid density")
+    if bulk_modulus <= 0:
+        raise ValueError("Impossible bulk modulus")
+
+    return (bulk_modulus / density) ** 0.5
+
+
+if __name__ == "__main__":
+    import doctest
+
+    doctest.testmod()