# Calculating the tidal volume ATPS (L)

Announcements Posted on
Why bother with a post grad? Are they even worth it? Have your say! 26-10-2016
1. If we want to calculate the ATPS, and were given for example that the total volume of expired air (L) was 30.6 L provided that the air was collected over an interval of 3-minutes, will ATPS in this case be: 30.6 L / 3 min = 10.2 ?

Thanks.
2. If we have the following values:

- Number of breaths in one-minute = 16
- Exhaled minute volume ATPS (L min-1) = 5.50

Will the tidal volume ATPS (L) be ---> 5.50 / 16 = 0.34 ?

Thanks.
3. If we were given the following values:

- Oxygen concentration of expired air = 16.7%
- Exhaled minute volume ATPS (L min-1) = 5.67

And, want to calculate the "Oxygen exhalation rate ATPS (ml min-1)", would it be as follows?

5.67 X 16.7% = 0.95

But, since the value has to be in (ml min-1), we should multiply by 1000, so, the final result will be 950 ml min-1

Is it correct this way?

Thanks.

## Register

Thanks for posting! You just need to create an account in order to submit the post
1. this can't be left blank
2. this can't be left blank
3. this can't be left blank

6 characters or longer with both numbers and letters is safer

4. this can't be left empty
1. Oops, you need to agree to our Ts&Cs to register

Updated: November 1, 2011
TSR Support Team

We have a brilliant team of more than 60 Support Team members looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out.

This forum is supported by:
Today on TSR

### Who is getting a uni offer this half term?

Find out which unis are hot off the mark here

### Brexit: Why you should study law

Poll
Useful resources
Study resources

The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.