27 results for “heat”
Matter, Energy & Physics
Energy and Heat
heat. At every step the total is conserved. Heat and temperature Heat is energy in its most
Article · 4 min read
Planet Earth
Weather and Climate
heat it absorbed when it evaporated, and that released heat is what powers thunderstorms and hurricanes
Article · 4 min read
Planets & the Solar System
Mercury and Venus
heat. Sunward of Earth lie two rocky worlds. Mercury is small, grey and pitted, baked on one side
Article · 3 min read
The Human Body
Skin, Hair and Nails
heat away. When you are cold, the vessels narrow to save heat, and tiny muscles pull
Article · 3 min read
Animals
Reptiles and Amphibians
heat. The cold-blooded animals have solved life's problems in their own way. Long before
Article · 3 min read
Chemistry
Water: The Strangest Ordinary Substance
heat store Water also soaks up a remarkable amount of heat before its temperature rises, because
Article · 3 min read
Planets & the Solar System
The Sun
heats it to about 15 million degrees. Under those conditions hydrogen nuclei, which normally repel each
Article · 4 min read
Chemistry
Chemical Reactions
heat and light. Leave a bike out in the rain, and over months shiny steel turns
Article · 3 min read
Space & the Universe
The Life of a Star
heat of nuclear fusion pushes outward. For most of a star's life the two are balanced
Article · 3 min read
Planet Earth
The Oceans
heat extraordinarily well, and the ocean has absorbed about 90 percent of the extra heat trapped
Article · 4 min read
The Human Body
The Heart and Blood
heat, spreading warmth from the working muscles and organs to the skin and extremities, and it delivers
Article · 4 min read
Planet Earth
The Atmosphere
heated from below by the warm ground, so it gets colder with height, about 6.5 degrees
Article · 4 min read
Matter, Energy & Physics
Light
heat from a fire; longer still, microwaves and radio waves, metres or kilometres from crest to crest
Article · 4 min read
Matter, Energy & Physics
Electricity and Magnetism
heated to five times the temperature of the Sun's surface. The force between charges is enormous
Article · 4 min read
Planet Earth
Inside the Earth
heat down there is partly leftover from Earth's formation, when colliding debris and sinking iron
Article · 4 min read
Planets & the Solar System
Uranus and Neptune
heat from its interior. Uranus has 13 faint, dark rings and 28 known moons, named for characters
Article · 4 min read
Space & the Universe
Black Holes
heated by friction to millions of degrees, glowing in X-rays. Some black holes launch jets
Article · 3 min read
Life & Biology
Dinosaurs and Mass Extinctions
heated the planet. Three others, at the ends of the Ordovician, Devonian and Triassic periods, each
Article · 3 min read
The Human Body
Muscles
Heat is a by-product of all this, which is why exercise makes you hot, and why your
Article · 4 min read
Life & Biology
Ecosystems and Food Webs
heat. Matter goes round and round. Chains and webs A food chain is the simple version
Article · 4 min read
Life & Biology
The Origin of Life
heat-loving microbe that lived on hydrogen and carbon dioxide, consistent with a home in hot, mineral
Article · 4 min read
Planet Earth
Rocks, Minerals and Fossils
heat and pressure without melting. Bury limestone deep enough and it recrystallises into marble. Squeeze shale
Article · 4 min read
Plants & Fungi
Seeds
heat. Weed seeds can lie in soil for decades until ploughing brings them into the light
Article · 4 min read
Planets & the Solar System
Jupiter
heating its interior until it erupts through hundreds of volcanoes, some throwing plumes 400 kilometres high
Article · 3 min read
The Human Body
The Senses
heat, cold and pain. Fingertips and lips have the most, and can feel textures a few millionths
Article · 4 min read
Animals
Birds
heat so well that birds thrive in cold no bare-skinned animal could survive. Feathers waterproof
Article · 3 min read
Animals
Mammals
heat in, and nearly all mammals have it, even whales, which are born with a few whiskers
Article · 4 min read
