IEC 60068-2-13:2021 specifies methods of test applicable to specimens which, during transportation, storage or in service, can be subjected to low air pressure. This fifth edition cancels and replaces the fourth edition, published in 1983. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: a) alignment with recently revised parts of IEC 60068-2; b) Clause 5: severities aligned with IEC 60721-2-3 and IEC 60721-3 (all parts); c) addition of Annex A (guidance on selecting the duration of exposure).