浴槽

1. Origins, structure, and basic meaning

• Structure: 浴槽 (よくそう) is a noun for a bathtub, the vessel filled with water for bathing.
• Basic usage: It appears when filling a tub with water or describing the tub's size and space.
  • 掃除した浴槽に温かい湯をためました。 — We filled the cleaned bathtub with warm water.
  • この浴槽は足を伸ばせるほど広いです。 — This tub is wide enough to stretch out your legs.

2. Common pitfalls and similar expressions

• Tub and bathroom
  • 浴槽 is the tub itself, whereas 浴室 is the bathing room containing the tub and washing area. The vessel being filled takes に.