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390. What are essential fatty acids?

Human body can synthesize most of the fats it require. However, two essential fatty acids, linoleic and alpha-linolenic, cannot be synthesized in the body and must be obtained from food. These basic fats, found in plant foods, are used to build other specialized fats called omega-3 and omega-6 fatty acids.
 
389. What is photosphere?

Photosphere is the outer shell of star from which light is radiated. It is the innermost layer of the solar atmosphere to which our eyes can penetrate through the superficial transparent layers. Our view is obstructed beyond this layer by the rapidly increasing opacity of the denser layers of the gas as we go inward through it. Temperature of photosphere for Sun is about 5,800 K and values of pressure & density are low.
 
388. How does potash alum arrest bleeding?

Bleeding can be stopped by coagulation of the blood (formation of a clot). Potash alum has highly charged Al3+ and (SO4)2- ions which act as neutralizing ions for the protein colloid in blood. This causes aggregation or clotting and this in turn stops the bleeding.
Chemical Formula of Potash Alum :
K2SO4.Al2(SO4)3.24H2O
 
387. What is mAh the unit of phone battery?

An ampere hour or amp hour is a unit of electric charge equal to the charge transferred by a current of one ampere flowing for one hour, or 3600 coulombs. The commonly seen milliampere hour (mAh or mA·h) is one-thousandth of an ampere hour (3.6 coulombs).
It is used as the amount of charge that can be storede inside a battery.
An ampere is a unit of measure of the rate of electron flow or current in an electrical conductor. One ampere of current represents one coulomb of electrical charge (6.24 x 1018 charge carriers) moving past a specific point in one second.
 
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