$2.8 atm$ is [[1]] psi.

The standard unit of pressure is 'atm' or atmospheric unit. Pressure has another unit, 'psi' or pound per square. The conversion between atm and psi is as follows;

$1 \mathrm{atm}=14.696 \mathrm{psi}$

Thus 2.8 atm can be converted as;

$2.8\times 14.696=41.1488\approx 41.15 \mathrm{psi}$

Hence, the answer is 41.15 psi.