<li>

a <dfn>current pressure state</dfn> (a string), initialized to the empty string.

</li>

representing the [=source type=] that triggered transition to the [=current pressure state=].

<dfn>Contributing factors</dfn> represent the underlying hardware metrics contributing to the [=current pressure state=]

[=current pressure state=] drop below or exceed an, per metric,

for the [=current pressure state=], return true.

a <dfn>[[\State]]</dfn> value of type {{PressureState}}, which represents the [=current pressure state=].

If |record|.{{PressureRecord/[[State]]}} is not equal to |state| and [=change in contributing factors is substantial=]

returns true, return true.