The question asks for the specific term that describes the temperature at which air becomes saturated with water vapor. This is a fundamental concept in meteorology and atmospheric science.
Correct Option: B) Dew point is the temperature to which air must be cooled to become saturated with water vapor, assuming no change in air pressure or moisture content. At this temperature, the air's relative humidity is 100%, and condensation can begin.
The question asks about the primary factor determining the air's capacity to hold water vapour. This is a fundamental concept in meteorology and atmospheric science. We need to identify the physical property of air that directly influences how much moisture it can contain before becoming saturated.
B) Its temperature — Temperature is the most crucial factor determining the air's capacity to hold water vapour. Warmer air can hold significantly more moisture than colder air. This is a fundamental principle in atmospheric science, explaining phenomena like cloud formation, precipitation, and humidity.
The question asks to identify the phase transformation that occurs during evaporation. Evaporation is a common physical process where a substance changes from its liquid state to its gaseous state.
Correct Option: D) Liquid to gaseous state. This accurately describes the process of evaporation, where liquid water transforms into water vapor (a gas).
To understand the main driving cause of evaporation, we need to recall the physical process of how a liquid changes into a gas. This phase change requires energy to overcome intermolecular forces.
Correct Option: D) Heat is the main driving cause of evaporation because it provides the necessary energy for liquid molecules to gain kinetic energy and escape into the gaseous phase.
The question asks for the specific term describing the heat energy required to change the state of a unit mass of a substance from liquid to vapor without a change in temperature. This concept is fundamental in thermodynamics and phase transitions.
Correct Option: C) Latent heat of vaporisation is the amount of heat energy required to convert a unit mass of liquid into vapour without a change in temperature. It is given by the formula:
\[ Q = mL_v \]where \(Q\) is the heat energy, \(m\) is the mass, and \(L_v\) is the latent heat of vaporization.
The question asks about the factor that simultaneously increases both the absorption and retention capacity of an air parcel for water vapour. This relates to the physical properties of air and water vapour, specifically how temperature affects the air's ability to hold moisture.
C) Increase in temperature. An increase in temperature causes air molecules to move faster and spread out, increasing the volume available for water vapour molecules. This raises the saturation point of the air, meaning it can absorb more water vapour and retain a larger quantity before becoming saturated and condensation occurs.