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The value of Tg depends heavily on the mobility of the polymer chain, and for most synthetic polymers lies between 170°K and 500°K (-103°C and 227°C). Pure crystalline polymers do not have a glass transition temperature because the glass transition temperature is only applicable to amorphous polymers.
What else can I help you with?
Define penetration index and show how it is related to temperature susceptibility?
high penetration index shows low temperature susceptibility, low penetration index shows high temperature suspectibility.
How would you define viscosity - index?
Viscosity index is a measure of how an oil's viscosity changes with temperature. Higher viscosity index oils are more resistant to changes in viscosity with temperature, making them perform more consistently across a range of temperatures.
Which index enables us to define an index on columns of two or more tables?
join index
What is the difference between temperature and heat index, and how does it affect our perception of the weather?
Temperature refers to the measure of how hot or cold the air is, while heat index takes into account both temperature and humidity to determine how hot it feels to the human body. The heat index can make it feel hotter than the actual temperature, impacting our perception of the weather and increasing the risk of heat-related illnesses.
How long has the Heat index been around?
The heat index, also known as the "apparent temperature," was developed in 1978 by Robert G. Steadman, a meteorologist. It combines air temperature and relative humidity to estimate what the temperature feels like to the human body. Since its introduction, the heat index has become an important tool for assessing heat-related health risks.
Is the heat index the same as temperature?
No, the heat index is not the same as temperature. The heat index takes into account both temperature and humidity to determine how hot it feels to the human body.
What is the index that combines air temperature and relative humidity to determine an apparent temperature?
The heat index is the index that combines air temperature and relative humidity to determine an apparent temperature. It measures how hot it feels to the body by taking into account the moisture content in the air, which affects the body's ability to cool itself through sweating. High heat indexes can indicate increased risk of heat-related illnesses like heat exhaustion or heat stroke.
Why should the temperature of the sample be controlled during the refractive index measurement?
Controlling the temperature of the sample during refractive index measurement is important because the refractive index of a substance is sensitive to temperature changes. Fluctuations in temperature can alter the refractive index value, leading to inaccurate results. By maintaining a constant temperature, you ensure that the refractive index measurement is reliable and accurate.
What is the index of refraction of air at room temperature?
The index of refraction of air at room temperature is approximately 1.0003.
Define the human poverty index?
The human poverty index is a collection of statistics set to measure the human condition. The different statistics are combined to make the index.
Why is it advisable to correct the measured refractive index for temperature?
The refractive index is a physical property of the medium that depends on the wavelength of the light, and the temperature. The temperature needs to be specified, and is usually 20 or 25 degree Celsius. The refractive index decreases with increasing temperature, and for most organic compounds one can correct for the temperature.
Is the heat index the same as the real feel temperature?
No, the heat index and real feel temperature are not the same. The heat index takes into account both temperature and humidity to calculate how hot it feels, while the real feel temperature considers factors like wind and sun exposure in addition to temperature.
