As air rises and undergoes adiabatic cooling (cooling due to expansion as it moves to regions of lower pressure), its temperature decreases. The relationship between temperature, saturation mixing ratio, and the process of adiabatic cooling is important to understand in this context.

The saturation mixing ratio is the maximum amount of water vapor that air can hold at a given temperature without condensation occurring. As air rises and cools, its temperature approaches the dew point temperature—the temperature at which the air becomes saturated and condensation begins.

Here's what happens to the saturation mixing ratio and temperature as air rises:

In summary, as air rises and undergoes adiabatic cooling, its temperature decreases. If the cooling causes the temperature to reach the dew point temperature, the air becomes saturated, and condensation occurs. The saturation mixing ratio is the maximum amount of water vapor the air can hold at a given temperature, and it helps determine when condensation will happen as the air rises and cools.

Dr Gaurav H Tandon thank you for your contribution to the discussion

The mixing ratio remains constant in a rising parcel of unsaturated air. This occurs because the amount of moisture in the parcel remains constant. Mixing ratio is defined as mass of water vapor divided by mass of dry air. Since the mass of water vapor remains constant then the mixing ratio stays constant.The pressure changes; the partial pressure of water vapor changes; the temperature changes and these changes occur in a way such that the temperature change eventually causes the water vapor mixing ratio to become equal to the saturation mixing ratio. Just as with saturation vapor pressure, the saturation mixing ratio, which specifies the maximum amount of water vapor that can be in the air, is determined by the air temperature ... the higher the air temperature, the greater the saturation mixing ratio. Surface interactions and environmental diagnostics the humidity mixing ratio (MR) is a natural tracer, invariant to temperature or pressure changes, but decreases if some moisture is removed, and increases if some moisture is added. The saturation mixing ratio changes at the greatest rate at warm temperatures. Increasing the temperature from 80 to 90 F will change the saturation mixing ratio more dramatically than changing the temperature from 30 to 40 F. Thus dWs/dT is higher in warm air. The saturation mixing ratio (ws) is the ratio of the mass of water vapor (Mv) to the mass of dry air (Md) in a parcel of air at saturation. In other words ws are the maximum amount of water vapor that a parcel can hold without condensation. Pressures in the atmosphere are sufficiently low that the ideal gas law is always obeyed to within 1%. The mixing ratio of a gas has the virtue of remaining constant when the air density changes. As it cools, the air's capacity for water vapor decreases. If the air cools to its dew point temperature condensation is forced and some of the water vapor in the air condenses into liquid water droplets.