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Tire Pressure Features Introduction

PSI & BARS
The maximum PSI (pounds per square inch) output refers to the maximum volume of air the pump can push into your tire, is an important consideration. Look for the recommended PSI rating label on the side of the tire. The pump you choose has to match or exceed the recommended air pressure your tires can handle. Otherwise, you won't be able to adequately inflate the tires, no matter how much you pump.
Pounds per square inch (psi) is the standard US measurement; "bars" are the metric equivalent. An approximate guide to recommended tire-pressure range:
  • Road bike: 80-130 psi / 5.5-9 bars
  • Comfort bike: 35-70psi / 2.2-4.8 bars
  • Mountain bike: 30-60psi / 2.1-4.2 bars

HV & HP
There are 2 types of pump system to look for - High volume low pressure and High pressure low volume. In short, we call it HV (High Volume) pump and HP (High Pressure) pump. The max PSI output of HV pumps range between 60 PSI to 90 PSI, whereas HP pumps range between 110 PSI to 260 PSI.  

Mountain bike tires require a lower capacity of air pressure between 25PSI to 40PSI. Hence, both HV and HP pumps are compatible; they can be used on MTB's tires. Typically, road bike tires require a higher PSI than a mountain or hybrid bikes:
air pressure between 100PSI to 160PSI and above, depending on the types of tyre. For instance, a “700 x 23C” tire usually range from 100PSI to 120PSI, and a tubular tire will be from 160PSI and above. So, HV pumps will not be compatible for this category; only HP pumps can be used.

https://www.rei.com/learn/expert-advice/bike-pumps.html
http://www.neweracycle.com/how-to-choose-the-right-bicycle-pump
https://www.thesportsup.com/choose-right-pump-bike/