International Science Community Association Research Journal of Chemical Sciences 15 2 2025 06 18 Unveiling the physicochemical behaviour of homoeopathic dilutions of acidum phosphoricum at different temperatures by using volumetric, acoustic and viscometric properties 41 65 EN Gupta Swaroopa Rani N. 1 Department of Chemistry, Brijlal Biyani Science College, Amravati, Maharashtra, India T. Sumathi 1 Department of Physics, Annamalai University, Annamalainagar – 608 002, India S. Parkavi 2 Department of Physics, Annamalai University, Annamalainagar – 608 002, India C. Soundaraj 3 Department of Physics, Annamalai University, Annamalainagar – 608 002, India K. Jetruth Mary Alphonsa 4 Department of Physics, Annamalai University, Annamalainagar – 608 002, India Shukla V.P. 1 Department of Chemistry Bipin Bihari College Jhansi-284001, India Kumar Anil 2 Delhi Technological University, Delhi-110042, India Bharti Karnam 3 Department of Chemistry Bipin Bihari College Jhansi-284001, India Kopdorah S.W. 1 Department of Biochemistry, Faculty of Basic Medical Science, University of Jos, Nigeria and Department of Biochemistry, Faculty of Science, Federal University Gashua, Yobe State, Nigeria Solomon M.D. 2 Department of Biochemistry, Faculty of Basic Medical Science, University of Jos, Nigeria Mafulul S.G. 3 Department of Biochemistry, Faculty of Basic Medical Science, University of Jos, Nigeria Nain Anil Kumar 1 Department of Chemistry, Dyal Singh College, University of Delhi, New Delhi – 110 003, India . Soumya 2 Department of Chemistry, Dyal Singh College, University of Delhi, New Delhi – 110 003, India Nayak Debadatta 3 Central Council for Research in Homeopathy, Ministry of AYUSH, New Delhi – 110 058, India Manchanda Raj Kumar 4 Nehru Homoeopathic Medical College & Hospital, University of Delhi, New Delhi – 110024, India > Research Paper 2025 3 16 2025 06 18 The physicochemical studies of homoeopathic medicines can provide better understanding regarding the presence and mechanism of their action in ultra-dilutions. The physicochemical behaviour of dilutions of acidum phosphoricum have been investigated from the measurements of densities, , ultrasonic speeds, u and viscosities,  of pure ethanol control and 33dilutions of acidum phosphoricum of potencies ranging from 1C to 200C (with intervals of 2C up to 30C and then with intervals of 10 C up to 200 C) at six different temperatures and atmospheric pressure. From the experimental data, a number of physicochemical parameters, viz., the isentropic compressibilities, s, intermolecular free length, Lf, acoustic impedance, Z, relative association, RA, deviations in isentropic compressibility, s, deviations in intermolecular free length, Lf, deviations in acoustic impedance, Z and deviations in viscosity,  have been evaluated. These parameters show anomalous behaviour at certain potencies, viz., 1C, 6C, 8C, 12C, 22C, 70C, 80C, 100C, 120C and 170C to 180C, of these homoeopathic dilutions. The results have been qualitatively discussed in terms of interactions between H+/phosphate ions and dissipative structures of ethanol-water molecules in these acidum phosphoricum dilutions. The results indicated that that even in extreme dilutions the molecules of acidum phosphoricum may be present in these homoeopathic dilutions. Copyright@ International Science Community Association