The distribution of stomata per unit area of a leaf and their size affects the rate of

The distribution of stomata per unit area of a leaf and their size affects the rate of Transpiration.
Transpiration is a process that involves the loss of water vapour through the stomata of plants. The loss of water vapour from the plant cools the plant down when the weather is very hot, and water from the stem and roots moves upwards or is 'pulled' into the leaves.
Transpiration is closely related to stomata. Nearly 97% of the water from plants is lost through stomatal transpiration, so the more stomata, the higher the transpiration rate.