# Volume flow rate

1. Dec 5, 2014

### Erdo

• Member warned about posting questions without the homework template
Hey guys,
can some of ou help me with this question:
I need to calculate the volumic flow rate for air by using the ideal gas law. Things i know from the assignment:

molarmass = 28,96 kg/kmol
Pressure = 1 bar
mass flow = 2 kg/s
t in = 20 degrees celcius
t out = 50 degrees celcius
(sorry for bad english, from denmark)

2. Dec 5, 2014

### SteamKing

Staff Emeritus
PF asks that you post homework and other assignment questions to one of the HW forums.

3. Dec 5, 2014

### Staff: Mentor

From the ideal gas law, what is the density of the air at 20C? what is the density of the air at 50C?

Chet

4. Dec 11, 2014

### Erdo

well jeg think it's 1000 kg/m^3, because nothing else is given.

5. Dec 11, 2014

### SteamKing

Staff Emeritus
That's some pretty dense air. A cubic meter of a-i-r has a mass of 1000 kg? Are you sure?

6. Dec 11, 2014

### Staff: Mentor

That's the density of water, not air. You need to use the ideal gas law to get the density of air under the process conditions.

Chet