Some indicators are liquids, meaning we can add drops of the ... purple for strongly alkaline solutions. In the middle, neutral pH 7 is indicated by green. When using universal indicator paper ...

A new study finds that ocean acidity may have prevented life on Earth from developing for the planet’s first 500 million ...

Study first author Dr Rattapol Phandthong said: "Users who vape aerosols produced from propylene glycol/vegetable glycerin alone or e-liquids with a neutral to basic pH are more likely to be ...

"Users who vape aerosols produced from propylene glycol/vegetable glycerin alone or e-liquids with a neutral to basic pH are more likely to be infected by the virus, while users who vape aerosols ...