気化（きか、kika）
- vaporization

The Japanese word 気化 （きか, *kika*) means "vaporization" or "evaporation." It refers to the process by which a substance changes from a liquid or solid state to a gaseous (vapor) state. This transformation usually happens due to an increase in temperature or a decrease in pressure. 気化 is a scientific term primarily used in fields like chemistry and physics but can also be used in everyday contexts when discussing the state of matter. ⚫︎ It is important to remember that 気化 is a noun, representing the *process* of changing state. ⚫︎ The word is derived from the kanji 気 (ki) meaning "spirit", "energy", or "state," and 化 (ka) meaning "change" or "transformation." ⚫︎Therefore, 気化 literally means "to change into a gaseous state."

⚫︎ 水が気化して水蒸気になる。 Translation: The water vaporizes and becomes steam. ⚫︎ 液体窒素は常温で急速に気化する。 Translation: Liquid nitrogen rapidly vaporizes at room temperature. ⚫︎ 夏の暑さでアスファルト上の水たまりが気化した。 Translation: The puddles on the asphalt evaporated in the summer heat.

⚫︎ Use 気化 when discussing the scientific process of evaporation or vaporization. ⚫︎ This word is suitable for formal and informal contexts, depending on the topic. ⚫︎ It's often used when talking about the behavior of substances in different temperatures and pressures, such as in science class or when discussing weather. ⚫︎ The related verb form is 気化する (*kika suru*), which means "to vaporize" or "to evaporate". You can also use this verb form in various tenses and conjugations. ⚫︎ For instance, you could use phrases like: 気化し始めた（*kika shi hajimeta*, began to vaporize), 気化した（*kika shita*, vaporized), or 気化するだろう（*kika suru darou*, will vaporize).

⚫︎ The word is written in kanji as 気化. ⚫︎ The reading is きか in hiragana. ⚫︎ It is not typically written in katakana. ⚫︎ The okurigana is 化. There are no variations in the okurigana.

⚫︎ 蒸発 (*jouhatsu*) – evaporation (often used in more general terms.) ⚫︎ 昇華 (*shouka*) – sublimation (the process of a solid changing directly into a gas) ⚫︎揮発 (*kihatsu*) – volatilization (used for liquids that change easily into gas at room temperature)

⚫︎ 凝縮 (*gyoushuku*) – condensation (the opposite of vaporization; the process of a gas turning into a liquid) ⚫︎ 液化 (*ekika*) – liquefaction (the process of a gas turning into a liquid) ⚫︎ 固化 (*koka*) – solidification (the process of a liquid turning into a solid)

水は100℃で気化し始める。 ・Translation: Water starts to vaporize at 100°C. ・Explanation: This sentence explains the temperature at which water undergoes vaporization.

化学実験で、エタノールが気化してしまった。 ・Translation: In the chemical experiment, the ethanol vaporized. ・Explanation: This sentence describes the vaporization of ethanol during a chemistry experiment.

The word 気化 is formed from the combination of two kanji: 気 (*ki*) and 化 (*ka*). 気 has various meanings, including "spirit," "energy," or "state," and in this context, it refers to the state of being a gas. 化 means "change" or "transformation." Therefore, the word 気化 originally means "the process of changing into a gaseous state."