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The polydiacethylenes (PDAs) change colour from blue to red when heated
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Is liquid nitrogen used in refrigerators for cooling?
No. Refrigerators use a substance called Freon that can readily change from liquid to gas to liquid, moving heat from inside the fridge to the outside. Liquid nitrogen is FAR too cold, and requires too much energy to make the change from gas to liquid.Yes, liquid nitrogen is used in refrigerators. Nitrogen is a diatomic gas. The two nitrogen atoms are bond with a triple bond.
Do leaves change color the same time every year?
Not always. The weather and the temperature have a lot to do with it. If it stays warm they change later, if it gets cold sooner they change sooner.
What are some characteristics of fall?
Leaves that change color from green to red, orange, and yellow, Cold and windy, Leaves fall off trees, very vibrant and beautiful.
Why can you see your breath outside in cold weather what phase change is it?
Physical. What's actually visible is not "breath", but rather the moisture in the breath condensing in the colder air. This is a change in physical state from vapor to liquid (in the form of tiny droplets), so it is a physical change.
What is the temperature in the water?
If it's liquid, the temperature may be as cold as 27 degrees F, owing to the high mineral content of the water.
Why do foxes change colors?
Their coats change color to camoflauge
How does waters state change into ice?
Get it cold enough, and its state will change from liquid to solid.
Why your skin color change when you cold?
You skin changes color when it's cold because blood can't flow as easily.
What causes a change in matter from gas to liquid?
it changes when it gets cold
When does gas change to liqud?
I believe gas would change to liquid when it's starting to get cold.
What stage of the water cycle does the water get cold and change from a gas into a liquid?
plasma
What is the process of liquid turning into solid in cold temperature?
freezing (phase change)
How do rabbits adapt to cold weather in northern us?
They change color.
How do hot-wheels color shifters change color?
we should put them in hot, warm or cold water
What does freezeing mean?
the withdrawal of heat to change something from a liquid to a solid freeze is when a liquid turns back into a solid. or if it is cold outside instead of cold you could use the word freeze or freezing
How do chemicals change material?
Chemicals chAnge their state or form when energy is added ie heaT OR COLD CHANGE TO SOLID LIQUID OR GAS
What change takes place in the liquid inside a thermometer when the thermometer is placed into something cold?
The liquid in thermometers contracts when placed in something cold (and expands when placed in something hot.)
