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On the other hand, the gel point of crude oil is dependent upon the composition of the crude oil as some crude oils contain more or less components that dissolve the paraffins. In some cases the gel point of a crude oil may be correlated from the pour point. [1] [2] The gel points of some common petroleum products are as follows:
When the temperature is below 0 °C, the dew point is called the frost point, as water vapour undergoes gas-solid phase transition called deposition, solidification, or freezing. In the petroleum industry, cloud point refers to the temperature below which paraffin wax in diesel or biowax in biodiesels forms a cloudy appearance.
Freezing point (°C) K f (°C⋅kg/mol) Data source; Aniline: 184.3 3.69 –5.96 –5.87 K b & K f [1] Lauric acid: 298.9 44 –3.9 Acetic acid: 1.04 117.9 3.14 16.6 ...
Paraffin oil is commonly used to fill Galileo thermometers: Due to paraffin oil's freezing temperature being lower than that of water (approx. −4 °C (24 °F)), this makes them less susceptible to freezing during shipment, or when stored in a cold environment. [37]
Freezing is a phase transition in which a liquid turns into a solid when its temperature is lowered below its freezing point. [ 1 ] [ 2 ] For most substances, the melting and freezing points are the same temperature; however, certain substances possess differing solid-liquid transition temperatures.
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Sunflower oil, high oleic: Refined: 232 °C: 450 °F [3] Sunflower oil, high oleic: Unrefined: 160 °C: 320 °F [3] Vegetable oil blend: Refined: 220 °C [13] 428 °F