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the pH of [NP]
The pH of the water is 7.0.
水的pH值是7.0。
氢离子指数，pH值
先理解核心含义，再看它在真实句子里的用法。
氢离子指数，pH值
a measure of acidity or alkalinity of a solution on a scale from 0 to 14, where 7 is neutral
The pH of the water is 7.0.
水的pH值是7.0。
表示水溶液酸碱性(pH低为酸性,pH高为碱性)的量度,等于水合氢离子浓度(摩尔/升)的负对数。
Measure of the acidity (low pH) or basicity (high pH) of an aqueous solution, equal to the negative logarithm of the concentration of hydronium ions in molars.
The gardener tested the soil's pH before planting the roses.
园丁在种玫瑰前测试了土壤的pH值。
You should check the pH of your aquarium water regularly to keep the fish healthy.
你应该定期检查鱼缸水的pH值，以保持鱼的健康。
The pH of lemon juice is around 2, making it very acidic.
柠檬汁的pH值约为2，因此非常酸。
The pH of the water is 7.0.
水的pH值是7.0。
A pH of 7 is neutral.
pH值为7是中性的。
注意：在汉语中，常将pH与'值'连用，如'pH值'。
High pH can indicate alkalinity.
高pH值可以表示碱性。
Not this
The ph number of pure water is 7.
Use this
The ph of pure water is 7.
中文学习者常将'ph'视为可数名词，并使用'number'，但'ph'本身即表示氢离子指数，无需加'number'，正确用法是直接说'the ph of'或'ph value'。
Not this
Please ph the solution before adding acid.
Use this
Please measure the ph of the solution before adding acid.
中文学习者可能受中文'测ph值'影响而将'ph'用作动词，但英语中'ph'仅为名词，需使用动词'measure'或'test'来表达测量ph值的动作。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
pH值
The pH level of pure water is 7.
纯水的pH值是7。
pH数值
A pH value below 7 indicates acidity.
pH值低于7表示酸性。
pH标度
The pH scale ranges from 0 to 14.
pH标度的范围是0到14。
酸碱平衡
Proper pH balance is essential for healthy skin.
适当的酸碱平衡对健康皮肤至关重要。
pH测试
We performed a pH test on the soil sample.
我们对土壤样本进行了pH测试。
pH计
A pH meter is used to measure acidity precisely.
pH计用于精确测量酸度。
Use pH naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
pH值：p像天平砝码，H代表氢离子，7是平衡点，酸碱由此定。
语域：技术/正式。常见使用场景：化学、生物学、医学、环境科学。通常用于表示氢离子浓度指数（pH值），多出现在学术或专业文献中。
Words ending in 'ph' are usually pronounced with /f/ (e.g., graph, photograph) or /mf/ (triumph, nymph), while 'ph' is pronounced as individual letters /piː eɪtʃ/. None rhyme.
Dictionary facts from ECDICT, WIKTIONARY.