Everyday Science
14 questions tagged Everyday Science — spanning every one of the seven Ws.
How does a microwave oven work?
A microwave oven heats food by bombarding it with microwaves that make water molecules vibrate rapidly, and that molecular motion is heat generated throughout the food.
What is sound?
Sound is a wave of vibrations travelling through a medium like air or water. It cannot travel through the vacuum of space.
How does a refrigerator work?
A refrigerator keeps food cold by pumping a special fluid around a loop that absorbs heat from inside and releases it outside.
How do magnets work?
Magnets work because the electrons in certain materials align, creating a magnetic field that attracts or repels other magnetic objects.
Why Does Salt Melt Ice?
Salt lowers the freezing point of water (freezing-point depression), causing ice to melt at temperatures below 0 °C.
Why Does Metal Feel Colder Than Wood?
Metal feels colder than wood at the same temperature because metal conducts heat away from your skin much faster; your nerves sense the rate of heat loss, not the actual temperature, so fast-conducting metal feels colder.
How does a microwave oven work?
A microwave oven cooks food by emitting microwaves that make water molecules in the food vibrate rapidly, and this molecular motion generates heat throughout the food.
How does air conditioning work?
An air conditioner pumps heat out of a room by circulating a refrigerant that absorbs heat indoors as it evaporates and releases it outdoors as it condenses.
Why are bubbles round?
Surface tension pulls the soap film as tight as possible. A sphere holds a given amount of air with the smallest possible surface, so bubbles become round.
Why do ice cubes crack when dropped in a drink?
The outside of the ice warms and expands faster than the frozen core, creating stress that splits it.
Why does water make things wet?
Things get wet when water molecules are more attracted to a surface than to each other, so they spread and cling.
Which force plays the smallest role in everyday objects?
Gravity plays the smallest role in the behavior of everyday small objects compared with electromagnetism. It becomes noticeable only when masses are large.
Where is chlorine most commonly found in everyday life?
Chlorine is most commonly found as chloride in table salt, seawater, and many minerals. Pure chlorine gas is used in industry, but naturally it is usually found in compounds.
Which force is the best-known example of a non-contact force in everyday life?
Gravity is the classic everyday non-contact force. Objects fall and planets orbit without physical contact because gravity acts at a distance.