A thermometer
a thermometer
A vacuum flask keeps hot things hot & cold things cold. Just how it tells the difference is one of the mysteries of the scientific world !
it tells it when things are hard to open or hot or cold.
skin
thermometer
Turtle
how cold or hot it is
Cold things.
If i get the awnser ill tell you.
Temperature tells what degrees it is like how hot or cold something is
Hot things get cooler, and cold things get warmer, because they exchange heat with their surroundings. A "cool bag", whatever that is, is apparently designed in such a way as to prevent that (probably it's insulated).
The physical property that tells you how hot or cold matter is, we call temperature. Temperature consists of random motion on the atomic or molecular scale. Faster moving particles have higher temperatures.