Final answer:
A says that if the cooling system pressure is reduced, the coolant boiling point is increased. B says when more antifreeze is added to the coolant (up to an 80/20 mix), the coolant boiling point is increased. A and B are both correct.
Step-by-step explanation:
A says that if the cooling system pressure is reduced, the coolant boiling point is increased.
B says when more antifreeze is added to the coolant (up to an 80/20 mix), the coolant boiling point is increased.
A and B are both correct.
When the pressure on the cooling system is reduced, the boiling point of the coolant increases. This is because decreasing the pressure lowers the vapor pressure of the coolant, making it more difficult for the coolant to transition from the liquid phase to the gas phase.
Additionally, adding more antifreeze to the coolant increases the boiling point. Antifreeze is a solute that lowers the freezing point and raises the boiling point of the solution. The higher the concentration of antifreeze, the greater the boiling point elevation.