MACH

Excel Usage

=MACH(V, c)

• V (float, required): Velocity of fluid [m/s]
• c (float, required): Speed of sound in fluid [m/s]

Returns (float): Mach number [-]

Examples

Example 1: Subsonic flow (Mach < 1)

Inputs:

V	c
33	330

Excel formula:

=MACH(33, 330)

Expected output:

0.1

Example 2: Sonic flow (Mach = 1)

Inputs:

V	c
340	340

Excel formula:

=MACH(340, 340)

Expected output:

1

Example 3: Supersonic flow (Mach > 1)

Inputs:

V	c
500	340

Excel formula:

=MACH(500, 340)

Expected output:

1.471

Example 4: Low velocity example

Inputs:

V	c
10	300

Excel formula:

=MACH(10, 300)

Expected output:

0.0333

Python Code

from fluids.core import Mach as fluids_Mach

def mach(V, c):
    """
    Calculate the Mach number.

    See: https://fluids.readthedocs.io/fluids.core.html#fluids.core.Mach

    This example function is provided as-is without any representation of accuracy.

    Args:
        V (float): Velocity of fluid [m/s]
        c (float): Speed of sound in fluid [m/s]

    Returns:
        float: Mach number [-]
    """
    try:
      V_val = float(V)
      c_val = float(c)

      if c_val <= 0:
        return "Error: Speed of sound must be positive"

      result = fluids_Mach(V_val, c_val)
      return float(result)
    except Exception as e:
      return f"Error: {str(e)}"

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