「主题与语篇填空」Metals expand when 1.(heat)and contractwhen cooled. How do they react with different 2.(substance)? Let's do a simple experiment.The aim of this experiment is to discover 3.iron rusts in dry air and in ordinary water. To carry out theexperiment, you need the 4.(fo...
We use this idea in gadgets such as thermometers, which measure temperatures precisely using metals that expand when they're heated and contract when they're cooled. Some materials signal temperature changes even more dramatically by changing color as they get hotter or colder: we say they're ...
A portable air conditioner’s primary job is to pull in room air, chill it to the correct temperature by removing heat, and then circulate the cooled air back into the area. The basic AC components involved include: The evaporator coil and the refrigerant are responsible for cooling the air...
When the water dispenser has not been used for a long time If the dispenser has not been used recently the first glass of water may not be as cool. (The residual water in the water pipe may become hot.) Dispensers may need approximately 2 to 3 hours to chill...
How does a water-cooled air conditioner work? How Air Conditioners Work How Car Cooling Systems Work Frequently Asked Questions What happens to the overall temperature of a room when a fan is operating in it? When a fan operates in a room, it does not decrease the room's overall temperatur...
iPhones are designed to work best when it’s between 0°c and 35°c. So, if you ever find yourself in sweltering heat or sub-zero temperatures, your iPhone might struggle to cope. Continued exposure to heat can affect your iPhone’s battery over time. When it’s too hot, the battery...
If you swapped your eyes for a couple of the world's most powerful microscopes, you'd be able to see things 100 million times smaller: bacteria, viruses, molecules—even the atoms in crystals would be clearly visible to you!Ordinary optical microscopes (light-based microscopes), like the ...
For much of the time that there have been markets for both, oil and natural gas prices were correlated—they tended to go up and down together. Yet, often enough in recent years, when oil prices surge, natural gas prices remain surprisingly subdued. This leaves consumers and investors...
Most solid materials expand upon heating and contract when cooled. The change in length with temperature for a solid material can be expressed as: wherel0andlfrepresent, respectively, the original and final lengths with the temperature change fromT0toTf. The parametera1CTE and has units of recip...
Global demand also has cooled off — partly because the U.S. Federal Reserve and other central banks haveraised interest ratesto combat inflation and partly becauseChina’s powerhouse economyis sputtering.Inflation has come downover the past year and a half, though it’s still higher than...