Assertion: sunscreen's spf | /r/HasProperty | relative measure
Facets:
Source sentences:
text: SPF is a relative measure of how long a sunscreen will protect you from sunburn.
text: The SPF is a relative measure of how long it will take for unprotected skin to burn in the sun compared to how long it will take if the recommended amount of sunscreen is used.
text: SPF (sun protection factor) is a relative measure of how long a sunscreen will protect you from ultraviolet (UV) B rays.