  We performed resonant microwave measurements on superconducting titanium (Ti)
down to temperatures of 40~mK, well below its critical temperature
$T_\mathrm{c} \approx 0.5$~K. Our wide frequency range 3.3-40~GHz contains the
zero-temperature energy gap $2\Delta_0$ and allows us to probe the full
electrodynamics of the superconducting state, including excitations across the
gap and the low-frequency responses of superfluid condensate and thermal
quasiparticles. The observed behavior follows the predictions of the BCS-based
Mattis-Bardeen formalism, which implies that superconducting Ti is in the dirty
limit, in agreement with our determination of the scattering rate. We directly
determine the temperature dependence of the energy gap, which is in accordance
with BCS predictions, and $2\Delta_0/k_\mathrm{B}T_\mathrm{c}\approx3.5$ with
$\Delta_0 \approx$ 75~$\mu$eV. We also evaluate the penetration depth, and we
characterize the behavior of superconducting Ti in external magnetic field.
