Final answer:
A level difference arrow represents the change in the value of a quantity between two points or levels, while a total difference arrow represents the change in the total value of a quantity.
Step-by-step explanation:
In physics, a level difference arrow and a total difference arrow are both used to represent changes in quantity, but they have different interpretations.
A level difference arrow represents the change in the value of a quantity between two points or levels. It shows the absolute difference between the values at those points. For example, if the level at point A is 10 units and the level at point B is 15 units, the level difference arrow would be 5 units.
A total difference arrow, on the other hand, represents the change in the total value of a quantity. It shows the difference between the total values at two points. For example, if the total at point A is 100 units and the total at point B is 120 units, the total difference arrow would be 20 units.