Approximately how many more minutes of nitrous oxide remain when the tank pressure drops below 745 psig and the flow rate is set to 2 liters per minute?

When the tank pressure drops below 745 psig, it indicates that the tank is nearing the end of its supply of nitrous oxide. At this point, understanding the flow rate helps in estimating the remaining usable time in the tank.

Given a flow rate of 2 liters per minute, it's essential to know the total amount of nitrous oxide remaining in the tank at that pressure level. Usually, a full nitrous oxide tank contains approximately 5,000 liters or more of gas when full. When the pressure is around 745 psig, a significant amount of nitrous oxide is still present since the liquid phase under pressure transitions to a gas phase.

To calculate the time remaining, you can approximate the total volume of nitrous oxide available divided by the flow rate. For instance, if there are around 400 liters remaining (a common approximation for tanks at this stage), and you are using 2 liters per minute, you would calculate the time by dividing 400 liters by 2 liters per minute, resulting in around 200 minutes of useable gas left.

This extensive timeframe underlines that even at lower pressures, there is still a considerable supply of nitrous oxide, allowing for prolonged usage at the specified flow rate. Thus,