Spf24是什麼意思

"SPF24" is a term used in sun protection, where "SPF" stands for "Sun Protection Factor." The number "24" indicates the level of protection the sunscreen provides against UVB rays, which are the primary cause of sunburn.

Here's a brief explanation of what SPF means:

• SPF (Sun Protection Factor): This is a measure of the effectiveness of a sunscreen in protecting the skin from UVB rays.
• UVB rays: These are the primary cause of sunburn and are also linked to skin cancer.
• SPF 24: A sunscreen with an SPF of 24 will protect you from 97.5% of UVB rays. This means that out of 100 UVB rays that reach your skin, only 2.5 will be able to penetrate the sunscreen and potentially cause harm.

When choosing a sunscreen, it's important to select one with an SPF that meets your needs. For most people, an SPF of 30 or higher is recommended for adequate protection. It's also important to apply the sunscreen correctly and reapply it every few hours, especially after swimming or sweating.