What is the purpose of a tractor? To plow fields.
To harvest wheat.
To haul loads of manure, hay etc.
To power other machines.

to plow fields beacuse it's much easier to plow on tractor than on foot

the temperature and the pressure affect solubility. temperature affects by changing the properties of the solvent. the increase in pressure increases solubility, the decrease in pressure decreases solubility.