Heating water for a bamboo bath with 湯を沸かす

Mikochi, long-haired and in a cap, holds a large pair of tongs and looks at Hakumei. Hakumei, curly-haired with goggles around her neck, smiles and answers her.
ハクメイとミコチ » Volume 4 » Page 123

Hakumei and Mikochi went to a newly opened hot spring, only to find it closed for cleaning. Instead of giving up, they decided to build their own open-air bath by splitting a giant bamboo stalk in half. Hakumei split the bamboo while Mikochi cooked over a campfire. Then Hakumei, gathering stones near the fire, called for Mikochi to bring a pair of tongs.

ミコチ:
「何(なに)に使(つか)うの?」
“What are they for?”
ハクメイ:
「湯(ゆ)を沸(わ)かすんだよ」
“To heat the water.”
Literal: “I'm going to boil hot water.”

Key Points

1湯(ゆ)を沸(わ)かす = to heat water
  • 沸(わ)かす means to heat a liquid until it’s hot or boiling. Japanese names the result, so the object is 湯(ゆ), “hot water”, even before it’s hot.
  • The same verb heats a bath: 風呂(ふろ)を沸(わ)かす. Hakumei is heating water for the bamboo tub, not for cooking. On the next page she uses the tongs to drop stones heated in the fire into the water.
  • Hakumei says plain 湯(ゆ), without the polite お that most speakers add in お湯(ゆ)を沸(わ)かす. Leaving it off fits her brisk, plain way of talking.
2〜んだよ = explaining
  • んだ is the casual form of のだ. It presents the line as an explanation. Mikochi brought the tongs without knowing why, and Hakumei fills her in.
  • よ marks information the listener doesn’t have yet.
3何(なに)に使(つか)うの? = What are they for?
  • 何(なに)に使(つか)う asks what something is used for. に marks the purpose: 料理(りょうり)に使(つか)う, “use it for cooking”.
  • The rising の asks for an explanation in casual speech. Hakumei answers in kind with んだよ.

Vocabulary

(What)

何(なに) asks what something is. It is read なに, or なん before certain sounds.

(To use)

使(つか)う is to use something as a tool or means. It also means to spend money or time.

(Hot water)

湯(ゆ) is heated water. It also means bath water or a hot bath, and appears in words like 銭湯(せんとう) and 湯船(ゆぶね).

(To boil)

沸(わ)かす means to heat a liquid until it boils, as in お湯(ゆ)を沸(わ)かす, “boil water”. It also means to heat a bath, and to stir a crowd to excitement.

See Also

ハクメイとミコチ © its respective creators. It is used here for educational commentary.