Who was the first person to discover the existence of electrons

JJ Thomson was the first person to discover the existence of electrons. Although Julius plucker in 1859 observed electrons he couldn't specify his observations instead Thomson was the one who further studied plucker observations and specified it as electrons..

relative humidity is a measure of the amount of moisture in the air relative to the total amount of moisture the air can hold.

so d

water and alcohols have similar properties because water molecules contain hydroxyl groups that can form hydrogen bonds with other water molecules and with alcohol molecules, and likewise alcohol molecules can form hydrogen bonds with other alcohol molecules as well as with water.