What process happens when a cloud forms?

The ground is heated up differently due to receiving different amount of insolation and air over warmer parts will rise first.

Rising air expand with low pressure at high altitude. Air mass cool and relative humidity increase and saturation humidity decreases. Air force upwards, surrounding air is not as warm as rising air.

When air reach dew point, water vapour starts to condense on atmospheric particles which acts as a condensation nuclei. Relative humidity reaches 100% saturation.

Cloud formation continues as high as air rises. When air stop rising, cloud development stops. More uplift means the clouds will be taller and deeper.

HOPE IT HELPS! :):)