Which of the following is NOT true?
evaporation occurs at any temperature of a liquid
boiling takes place only at the surface of the liquid
evaporation occurs only at the surface of a liquid
boiling of a liquid takes place at a definite temperature and pressure
"evaporation occurs only at the surface of a liquid" is NOT true.
To determine which of the statements is NOT true, we need to evaluate each one and identify any that do not align with scientific principles.
1. Evaporation occurs at any temperature of a liquid: This statement is true. Evaporation can occur at any temperature as long as the liquid is exposed to the atmosphere.
2. Boiling takes place only at the surface of the liquid: This statement is not true. Boiling is a rapid vaporization of a liquid that occurs throughout the entire volume of the liquid, not just at the surface.
3. Evaporation occurs only at the surface of a liquid: This statement is true. Evaporation refers to the process of a liquid turning into a gas at the surface of the liquid.
4. Boiling of a liquid takes place at a definite temperature and pressure: This statement is true. Boiling occurs when the vapor pressure of the liquid equals the atmospheric pressure or the pressure on the liquid's surface. This happens at a specific temperature for each substance.
Therefore, the statement "Boiling takes place only at the surface of the liquid" is NOT true, as boiling occurs throughout the entire volume of the liquid.