  Turbulent gas motions are observed in the intracluster medium (ICM). The ICM
is density-stratified, with the gas density being highest at the centre of the
cluster and decreasing radially outwards. As a result of this, Kolmogorov
(homogeneous, isotropic) turbulence theory does not apply to the ICM. The gas
motions are instead explained by anisotropic stratified turbulence, with the
stratification quantified by the perpendicular Froude number
($\mathrm{Fr}_\perp$). These turbulent motions are associated with density and
pressure fluctuations, which manifest as perturbations in X-ray surface
brightness maps of the ICM and as thermal Sunyaev-Zeldovich effect (SZ)
fluctuations, respectively. In order to advance our understanding of the
relations between these fluctuations and the turbulent gas velocities, we have
conducted 100 high-resolution hydrodynamic simulations of stratified turbulence
($256^2\times 384$ -- $1024^2\times1536$ resolution elements), in which we scan
the parameter space of subsonic rms Mach number ($\mathcal{M}$),
$\mathrm{Fr}_\perp$, and the ratio of entropy and pressure scale heights
($R_{PS}=H_P/H_S$), relevant to the ICM. We develop a new scaling relation
between the standard deviation of logarithmic density fluctuations ($\sigma_s$,
where $s=\ln(\rho/\left<\rho\right>)$), $\mathcal{M}$, and
$\mathrm{Fr}_{\perp}$, valid till
$\mathrm{Fr}_\perp\ll1$:~$\sigma_s^2=\ln\left(1+b^2\mathcal{M}^4+0.10/(\mathrm{Fr}_\perp+0.25/\sqrt{\mathrm{Fr}_\perp})^2\mathcal{M}^2R_{PS}\right)$,
where $b\sim1/3$ for solenoidal turbulence driving studied here. We further
find that logarithmic pressure fluctuations $\sigma_{(\ln{P}/\left<P\right>)}$
are independent of stratification and scale according to the relation
$\sigma_{(\ln{\bar{P}})}^2=\ln\left(1+b^2\gamma^2\mathcal{M}^4\right)$, where
$\bar{P}=P/\left<P\right>$ and $\gamma$ is the adiabatic index of the gas.
