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Reply To: Warm water below cold water at the beach?

Karthikeyan KC — Tue, 16 Apr 2024 09:49:06 +0000

That is an interesting observation, Colin. There could be a few reasons. I just read about upwelling, thanks to you. So it could be the primary reason, as you mentioned you were on the beach. Upwelling is basically the wind movements (parallel to the shoreline) displacing the warm water on the surface of the ocean, where the cold water wells up to replace it. Combine the effects of this with currents or local seabed heating, you might have felt warmer down than at the top. Do share the location where you experienced this and probably we could figure out more. I hope this answers your question to a degree.

Warm water below cold water at the beach?

Echo — Tue, 16 Apr 2024 09:45:17 +0000

I was at the beach in chest-deep water, and the water was significantly warmer at lower levels than near the surface. I had never experienced this before and thought that colder water was always below warmer water. How could the water be warmer near my knees than near the surface?

– Asked by Colin via the ask a science question page.

Reply To: Trackable chemical substance for paint or rubber that can be tracked by a device

Geekswipe Team — Tue, 16 Apr 2024 09:18:21 +0000

Hi Jon,

An interesting question. Not sure about the application of this, but you can achieve traceability by adding a UV luminescent dye to the paint. As it absorbs and emits UV, you can easily trace it with a simple UV lamp. If you want to track rubber and are sure that no other metal is present, you can add some magnetic particles into it and trace it with a magnet.

Trackable chemical substance for paint or rubber that can be tracked by a device

Echo — Tue, 16 Apr 2024 09:14:07 +0000

The question is whether there is a chemical additive to paint/rubber that can be traced by a handheld device. This is looking for a solution that is not reliant on GPS or a chip. The first thing that came to mind was radioactive isotopes and Geiger Counters. My concern is that it is difficult to get an approval for a hazardous material and that the geiger counter would not be able to find the object as it would not be strong enough for an efficient reading. The idea is that the object would contain the chemical, and the device could target the object (find it) within a 30m area. Could this be possible?

– Asked by Jon via the ask a science question page.