Define polarization vector. what is it's SI unit

The electric dipole moment induced per unit volume of the dielectric material is called the electric polarization of the dielectric. ... The SI unit of measure is coulombs per square meter, and polarization density is represented by a vector P.

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when in a crucial situation, after calling 911, the correct posture for delivering effective compression is the proper hand placement.

first, place two fingers at the sternum, then put the heel of your other hand next to the fingers and place hand on top of the other. lock your elbows by using your body’s weight and compress the victim’s chest with a depth of 2 inches.

moreover, do 15 compression and 2 breaths, this process must be done four times until there is a pulse or a arrive.