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Im- Imaginary Axis
- The y-axis of an Argand diagram.
- Imaginary Number
- i denotes the imaginary number formed by square rooting negative one.
- Imaginary Part
- The imaginary part of a complex number.
- Imbalance
- Unequal radial weight distribution on a rotor system.
- IMEP
- During the cycle of an engine useful work is only done on the power stroke.
- Immiscible
- Incapable of being mixed.
- Impact
- A collision of a mass in motion with a second mass.
- Impact Energy
- A measure of the energy absorbed during the fracture of a specimen of standard dimensions and geometry when subjected to very rapid loading
- Impact Harshness
- The interior sound and vibration resulting from tyre interactions with discrete road disturbances.
- Impact Isolation Class
- A measure or specification of isolation effectiveness of building structures from impact noises such as slammed doors, dropped objects, footfalls, shuffled furniture, etc. The higher the IIC rating, the better such isolation.
- Impact Test
- A test to determine the behavior of materials when subjected to high rates of loading, usually in bending, tension or torsion.
- Impedance
- Mechanical impedance is the ratio of a force-like quantity to a velocity like
quantity when the arguments of the real (or imaginary) parts of the quantities
increase linearly with time.
- Impedance of Free Space
- Z0 = 376.7304 Ohm
- Impeller
- A device that imparts motion to a fluid.
- Implosion
- A violent inward collapse.
- Improper Fractions
- A fraction whose numerator is of greater absolute value than it's denominator.
- Impulse
- The product of the force and the time during which it acts.
- Impulsive Noise
- A noise level that fluctuates over a range greater than 10 dB during observation is classified as impulsive.
- Impurity
- A foreign atom in a crystal.
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