Japan continues to astound the global community with its innovative technology and creative ideas. The nation seems to be living in a future that the rest of the world may not experience for many years. One such remarkable creation has captured the attention of social media, and it involves something as simple as a jam jar.
Steven W. posted a video on Instagram featuring a young girl demonstrating an intriguing feature: a jam jar lid that seals itself. Yes, you read that right. In the video, the girl places the lid onto the jar, and it automatically closes with no effort.
In disbelief, Steven exclaims, “What in the world?” In his post, he writes, “How is this possible?” Many viewers are sharing the same reaction.
The video has already garnered over 20 million views, sparking countless comments from curious users. One user explained, “It’s the ridges on the lid that make it work,” while another noted, “It was a lucky design, but the grooves in the glass angle cause the closure. You still need to tighten it a little, though.”
Another Instagram user mentioned, “I buy this jam often because it’s sugar-free, but I only just realized the lid closes itself. Though, it does need a little tightening.”
Explaining the science behind this, VT Physics on YouTube reveals that the jar’s ridges are angled at a precise 10-degree slope, much steeper than the typical 6-degree angle. This steeper angle creates a stronger gravitational pull and overcomes friction, allowing the lid to slide and close on its own.
Read also: