A bidirectional arrow symbol representing reversible chemical reactions or equilibrium relationships in chemistry and mathematics.
Examples
Chemical equilibrium reaction
H_2 + I_2 \rightleftharpoons 2HI
Complex chemical equilibrium with conditions
N_2 + 3H_2 \rightleftharpoons 2NH_3, \quad \Delta H = -92.4\text{ kJ}
Reversible process in thermodynamics
H_2O(l) \rightleftharpoons H_2O(g)