Word · Frequency #4255
pH
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
- 1.
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.
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。
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。；氢离子指数；[医] 药典; 苯基
In use
The gardener tested the soil's pH before planting the roses.
You should check the pH of your aquarium water regularly to keep the fish healthy.
The pH of lemon juice is around 2, making it very acidic.
the pH of [NP]
The pH of the water is 7.0.
水的pH值是7.0。
a pH of [number]
A pH of 7 is neutral.
pH值为7是中性的。
[adjective] pH
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。
Common mistakes
The ph number of pure water is 7.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'。
Please ph the solution before adding acid.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。
Connections
Collocations
- pH level
- pH值
- The pH level of pure water is 7.纯水的pH值是7。
- pH value
- pH数值
- A pH value below 7 indicates acidity.pH值低于7表示酸性。
- pH scale
- pH标度
- The pH scale ranges from 0 to 14.pH标度的范围是0到14。
- pH balance
- 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 test
- 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 meter
- pH计
Learner notes
Memory Tip
pH值：p像天平砝码，H代表氢离子，7是平衡点，酸碱由此定。
Context & Register
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。
Pronunciation & Spelling
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.
Usage priority
Collins 词频等级为 1，建议结合例句记忆，而不是只背中文释义。
Learn the forms together
页面下方列出了常见词形变化。学习时注意它们在句子中的语法位置。
Dictionary facts from ECDICT, WIKTIONARY.