GENERAL KNOWLEDGE

Detailed explanation-1: -When heated, the molecules of the liquid in the thermometer move faster, causing them to get a little further apart. This results in movement up the thermometer. When cooled, the molecules of the liquid in the thermometer move slower, causing them to get a little closer together.

Detailed explanation-2: -In order for a thermometer to measure the temperature of a body, it must be in intimate contact with the body. After making contact, every measurable property of the thermometer and the body assumes a stable value, and the bodies are said to be in thermal equilibrium.

Detailed explanation-3: -Red spirit-filled thermometers provide increased safety and economic pricing. They contain a kerosene-based column with red dye, which is significantly safer than mercury.

Detailed explanation-4: -The liquid in the thermometer goes up when the thermometer is heated because heating makes the alcohol molecules of the liquid move faster. The extra speed of the molecules competes with their attraction for one another and causes them to move slightly further apart.