Pumice is a low-density volcanic rock that consists of highly vesicular, rough, textured, volcanic glass, which may or may not contain crystals. It is typically light colored. Pumice is created when super-heated, highly pressurized rock is violently ejected from a volcano. The unusual foamy configuration of pumice happens because of simultaneous rapid cooling and rapid depressurization. This simultaneous process freezes bubbles from gases being dissolved in the lava and preserves them in a matrix, which gives pumice its highly porous texture. Pumice's highly unique process of formation yields an extremely low-density rock; in fact, pumice is the one and only rock that will not sink in water! Pumice floats and bobs along the surface where other rocks would sink to the depths. Great for understanding density and can be used in classroom experiments.
Included: one 1" chunk of pumice
Great exam quality Nitrile gloves in size SMALL.
High-protection, fluid-resistant and anti-static disposable lab coat in size Large.
These premium 5mil medical-grade Nitrile Exam Gloves are designed and manufactured for superior comfort and protection.
Box of 100 First Touch powder-free MEDIUM Nitrile exam gloves.
Highly durable lab apron made of rubberized cloth is impermeable and easy to clean, perfect for all manner of lab or classroom experiments
These disposable surgical-style earloop face masks conform to the ASTM F1862 Level 1 clasification. Box of 50.
Learn Chemistry While Creating Sweet Treats
Build your very own smart robot!
Get one of the craziest and coolest kaleidoscopes around!
The large realistic model has removable organs that can be studied and set back into the correct position.
Watch what your music can create with this amazing Snap Circuits set!
An ancient toy featuring optical illusion and hands-on fun that never grows old!
At xUmp.com you will find a large selection of scientific products carefully curated by real scientists and educators. We sell everything from educational toys, teacher supplies for science classroom, lab equipment, science toys, science fair supplies, classroom equipment, chemistry glassware, chemistry lab equipment, physics demos, electronics supplies, robots, science kits to geeky science gifts.