As the air molecules move through the valve they have friction as they hit the walls, and its this friction that causes it to heat up.
Your answer would be, Gas atoms subjected to the electricity emit bright lines of light.
Hop that helps!!!
Answer: You would need 1 mole of Fluorine
Explanation:The equation is already balanced so just looking at the coefficients in the equation we can see that Sodium Chloride (2NaCl) needs two moles for this equation and fluorine (F2) only needs one.
As you get higher the atmospheric pressure lowers. The pressure in the packet of crisps has the pressure at which it has been closed (pressure at the surface of the earth). This means that the air molecules in the packet press harder outside than the air molecules in the atmosphere press on the packet.
Answer: D) sweat requires a lot of thermal energy to be absorbed to evaporate
Explanation:
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