Final answer:
In a bathtub, the end result is usually 'B. Water Residue' due to leftover water post drainage. Safety messages on devices like hairdryers are because water conducts electricity well, posing an electric shock risk. Liters are the appropriate unit to measure a bathtub's capacity. Option b is the correct answer.
Step-by-step explanation:
When you finish using a bathtub, the correct answer is B. Water Residue. After draining the water post usage, a bathtub tends to have water residue: leftover water or film that remains on the surface. This is why the correct option is 'Water Residue' rather than drain closure, final soak, or empty vessel. Additionally, safety is key when using electronic devices such as hairdryers near water.
The warning message "Do not use when the bathtub or basin is full of water." is because water is a good conductor of electricity, and using electrical devices near water significantly increases the risk of electric shock.
When measuring the capacity of a bathtub, milliliters, which are too small to measure such large volumes, are not used. Instead, liters are the much more suitable unit of capacity for the relatively large amount of water a bathtub can hold. It's important to always prioritize safety in the bathroom, especially when dealing with electrical appliances and bodies of water.