<Dd> Main article: Rayleigh--Plesset equation </Dd> <P> The dynamics of the motion of the bubble is characterized to a first approximation by the Rayleigh--Plesset equation (named after Lord Rayleigh and Milton Plesset): </P> <Dl> <Dd> R R _̈ + 3 2 R _̇ 2 = 1 ρ (p g − P 0 − P (t) − 4 μ R _̇ R − 2 γ R) (\ displaystyle R (\ ddot (R)) + (\ frac (3) (2)) (\ dot (R)) ^ (2) = (\ frac (1) (\ rho)) \ left (p_ (g) - P_ (0) - P (t) - 4 \ mu (\ frac (\ dot (R)) (R)) - (\ frac (2 \ gamma) (R)) \ right)) </Dd> </Dl> <Dd> R R _̈ + 3 2 R _̇ 2 = 1 ρ (p g − P 0 − P (t) − 4 μ R _̇ R − 2 γ R) (\ displaystyle R (\ ddot (R)) + (\ frac (3) (2)) (\ dot (R)) ^ (2) = (\ frac (1) (\ rho)) \ left (p_ (g) - P_ (0) - P (t) - 4 \ mu (\ frac (\ dot (R)) (R)) - (\ frac (2 \ gamma) (R)) \ right)) </Dd>

A bubble of air is underwater at temperature