Ah, beta, water potential is just the total tendency of water to move... osmotic potential is from solutes, pressure potential is from physical pressure. The numbers? I remember the teacher saying it's negative for plant cells, maybe -0.5 to -2.0 MPa. But you see, I taught for years and never used these megapascals. My real numbers are the 500 rupees for my wife's medicine and the water potential in our dry village well—that tension I understood in my bones, not in a book.
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