At one atmosphere of pressure and temperatures above -33.3°C, ammonia exists as a gas. For transportation, ammonia is stored as a liquid under its own vapor pressure. This means that the liquid and gas phases exist simultaneously. If a container of ammonia is transported in a temperature-controlled truck that is maintained at no greater than 330 K, what maximum pressure p must the sides of the container be able to withstand? Express the answer numerically in atmospheres to one significant figure.