# @stem_antics on Instagram

- **Type:** Video
- **Original URL:** https://www.instagram.com/p/DUBItNFkQ6w
- **Gondola URL:** https://gondola.cc/posts/61936052-stem-antics-instagram
- **Thumbnail:** https://img.gondola.cc/tr:w-,h-,fo-auto/postThumbnails/7a5c0f9e5e.jpg
- **Posted:** 2026-01-27T14:38:42.000+00:00
- **Account Owner:** Stem Antics (@stem_antics) — https://gondola.cc/stem_antics

## Caption

Ever wondered how a single faucet knob controls both temperature and flow at the same time? 🔧💧
It’s not magic — it’s mechanical engineering + fluid dynamics working together.

Inside most modern faucets is a mixing valve. Hot and cold water enter through separate inlets under pressure. When you turn the handle, you’re not just “opening water” — you’re moving a valve cartridge that changes two things simultaneously:

1️⃣ Flow rate – how much water gets through
2️⃣ Mixing ratio – how much hot vs cold enters the chamber

In single-handle faucets, the handle motion is 2D:
	•	Up/down → increases or decreases the total opening area → more or less flow
	•	Left/right → shifts the relative opening sizes of hot and cold ports → temperature change

The cartridge uses overlapping ceramic or metal ports. As the handle moves, these ports slide over each other, changing the effective cross-sectional area for each water stream. According to fluid dynamics, larger area = higher volumetric flow rate (for the same pressure).

Both water streams mix before exiting, so by the time water leaves the faucet, you feel a single, smooth stream at a controlled temperature 🌡️

Engineering takeaway:
This is a compact example of mechanical control systems converting simple user motion into multiple coupled outputs — flow + temperature — with no electronics required.

STEM is hiding in plain sight 👀
Save this for your next “how does that work?” moment and share if you love everyday engineering.

#MechanicalEngineering #FluidDynamics #STEMEverywhere #EngineeringExplained #EverydayPhysics

## Stats

- **Views:** 1,141,971
- **Likes:** 77,480
- **Shares:** 0
- **Comments:** 18

## Tags

stemeverywhere, fluiddynamics, everydayphysics, engineeringexplained, mechanicalengineering

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