If you fall and skid to a stop on a carpeted floor, you can get a rug burn. Much of this discomfort comes from abrasion, but there can also be a real burn where the skin was too hot. When running, your body has energy.
When you fall, the friction between the carpet and your body transforms your initial energy into energy.
Because the surfaces in contact (your knees and the carpet) are heating up, it can result in a burn.

Scientific models are based on current knowledge, which can limit their effectiveness when new discoveries are made.

8.29 two streams containing pyridine and acetic acid at 25°c are mixed and fed into a heat exchanger. due to the heat-of-mixing effect, it is desired to reduce the temperature after mixing to 25°c using a stream of chilled ethylene glycol as indicated in the diagram. calculate the mass flow rate of ethylene glycol needed. the heat capacity of ethylene glycol at these conditions is approximately 2.8 kj/(kg k), and the enthalpy change of mixing (δmixh) is given below.

Ascientist wants to test ways to reduce pollution in lake . what is the bestway of doing this