What must be determined for every load of laundry in most washing machines?

For every load of laundry in most washing machines, it is essential to determine both the water temperature and the water level. This is because different types of fabrics and soils require specific washing conditions to achieve optimal cleaning results.

Water temperature plays a significant role in the effectiveness of detergents and the removal of stains. For instance, warm or hot water is often more effective for tackling greasy stains, while cold water is suitable for delicate items and helps prevent colors from bleeding.

Simultaneously, the water level needs to be adjusted depending on the size of the load. An appropriate water level ensures that clothes are adequately submerged and can move freely during the wash cycle, leading to better cleaning and rinsing.

By considering both the water temperature and water level, washing machines can optimize their performance and energy usage, catering to the needs of different laundry loads.