Isobaric (meaning of the same weight or pressure) may refer to:

• in thermodynamics, an isobaric process, i.e. one that is carried out at constant pressure;
• in mass spectrometry, ions with the same mass, e.g. isobaric peptides, namely peptides with the same molecular weight.
• isobaric speakers have a loudspeaker design where two drive units are mounted in tandem.

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