At 5,000 metres, walking uphill can leave you out of breath after twenty steps. Not because you’re unfit, and not because there is suddenly less oxygen in the air — there isn’t. What has changed is the air pressure, and
Science, survival, ecology and practical mountain knowledge for trekking in the Himalayas.
At 5,000 metres, walking uphill can leave you out of breath after twenty steps. Not because you’re unfit, and not because there is suddenly less oxygen in the air — there isn’t. What has changed is the air pressure, and