The drinking water standard for nitrate is 10 mg/l as n (i. e., drinking waters should not exceed this value). what quantity of nitrate ion does this concentration represent?

Alidded glass container is filled with a colored gas. after a period of time, it is observed that the gas is uniformly spread throughout the box and that the movement has slowed considerably. next, a warm iron plate is carefully placed under the box. why is there resumed movement of the gas in the container?