16 results for “pH”
Chemistry
Acids and Bases
pH scale Chemists measure how acidic or basic something is on the pH scale, which runs
Article · 3 min read
Plants & Fungi
Photosynthesis: How Plants Eat Light
Every leaf is a solar panel that turns sunlight, water and air into sugar and oxygen
Article · 3 min read
Animals
Whales and Dolphins
Mammals that went back to the sea, grew into the largest animals ever, and talk to
Article · 4 min read
Animals
Reptiles and Amphibians
Frogs that freeze solid and thaw out alive, lizards that run on water, snakes that see
Article · 3 min read
Planet Earth
The Atmosphere
The air is a thin shell of gas, mostly nitrogen, that keeps us warm, shields us
Article · 4 min read
Planet Earth
Weather and Climate
Weather is what the sky does today; climate is what it tends to do over decades
Article · 4 min read
The Human Body
Lungs and Breathing
Twenty thousand times a day you draw in air and your lungs, with a surface the
Article · 4 min read
Animals
Insects
Six legs, an outside skeleton and more species than every other kind of animal put together
Article · 3 min read
Matter, Energy & Physics
Light
Light is a wave, a particle and the fastest thing there is. Everything you see is
Article · 4 min read
Animals
Mammals
Fur, milk and warm blood unite a group that ranges from a 2-gram bat to
Article · 4 min read
Planet Earth
Rocks, Minerals and Fossils
Every pebble is a page in a 4.5-billion-year story. Learn to read the three
Article · 4 min read
The Human Body
The Immune System
An army of trillions of cells defends you against invaders you never notice, learns from every
Article · 4 min read
Matter, Energy & Physics
The Quantum World
At the scale of atoms the universe stops behaving sensibly. Particles are waves, things exist in
Article · 4 min read
Animals
The Octopus
Three hearts, blue blood, eight arms that think for themselves and a brain that evolved entirely
Article · 3 min read
Planets & the Solar System
The Moon
Earth's only natural satellite was born in a cataclysm, steadies our seasons, drives the tides
Article · 4 min read
Planets & the Solar System
The Sun
A ball of hydrogen a million times the volume of Earth, fusing 600 million tonnes of
Article · 4 min read
