page_title: Melting point
hierarchical_section_title: Melting point
caption_attribution_description: English: A thermometer put into a glass of ice and water showing that the temperature is 0 °C.
context_page_description: The melting point of a substance is the temperature at which it changes state from solid to liquid. At the melting point the solid and liquid phase exist in equilibrium. The melting point of a substance depends on pressure and is usually specified at a standard pressure such as 1 atmosphere or 100 kPa.
  When considered as the temperature of the reverse change from liquid to solid, it is referred to as the freezing point or crystallization point. Because of the ability of some substances to supercool, the freezing point is not considered as a characteristic property of a substance. When the "characteristic freezing point" of a substance is determined, in fact the actual methodology is almost always "the principle of observing the disappearance rather than the formation of ice, that is, the melting point.
context_section_description: The melting point (or, rarely, liquefaction point) of a substance is the temperature at which it changes state from solid to liquid. At the melting point the solid and liquid phase exist in equilibrium. The melting point of a substance depends on pressure and is usually specified at a standard pressure such as 1 atmosphere or 100 kPa.
  When considered as the temperature of the reverse change from liquid to solid, it is referred to as the freezing point or crystallization point. Because of the ability of some substances to supercool, the freezing point is not considered as a characteristic property of a substance. When the "characteristic freezing point" of a substance is determined, in fact the actual methodology is almost always "the principle of observing the disappearance rather than the formation of ice, that is, the melting point.
caption: Ice cubes put in water will reach the 0 °C melting point of ice when they start to melt.
exif: {"Image ImageWidth": "4032", "Image ImageLength": "3024", "Image BitsPerSample": "[8, 8, 8]", "Image PhotometricInterpretation": "2", "Image Make": "Apple", "Image Model": "iPhone X", "Image Orientation": "Horizontal (normal)", "Image SamplesPerPixel": "3", "Image XResolution": "72", "Image YResolution": "72", "Image ResolutionUnit": "Pixels/Inch", "Image Software": "Adobe Photoshop CS6 (Macintosh)", "Image DateTime": "2019:05:12 09:35:21", "Image YCbCrPositioning": "Centered", "Image ExifOffset": "296", "GPS GPSLatitudeRef": "N", "GPS GPSLatitude": "[59, 20, 5829/100]", "GPS GPSLongitudeRef": "E", "GPS GPSLongitude": "[18, 1, 409/100]", "GPS GPSAltitudeRef": "0", "GPS GPSAltitude": "476891/17906", "GPS GPSTimeStamp": "[22, 10, 35]", "GPS GPSSpeedRef": "K", "GPS GPSSpeed": "0", "GPS GPSImgDirectionRef": "T", "GPS GPSImgDirection": "194000/947", "GPS GPSDestBearingRef": "T", "GPS GPSDestBearing": "194000/947", "GPS GPSDate": "2018:11:15", "GPS Tag 0x001F": "1414", "Image GPSInfo": "872", "Thumbnail Compression": "JPEG (old-style)", "Thumbnail XResolution": "72", "Thumbnail YResolution": "72", "Thumbnail ResolutionUnit": "Pixels/Inch", "Thumbnail JPEGInterchangeFormat": "1278", "Thumbnail JPEGInterchangeFormatLength": "6869", "EXIF ExposureTime": "1/6", "EXIF FNumber": "9/5", "EXIF ExposureProgram": "Program Normal", "EXIF ISOSpeedRatings": "100", "EXIF ExifVersion": "0221", "EXIF DateTimeOriginal": "2018:11:15 23:11:36", "EXIF DateTimeDigitized": "2018:11:15 23:11:36", "EXIF ComponentsConfiguration": "YCbCr", "EXIF ShutterSpeedValue": "100357/39257", "EXIF ApertureValue": "54823/32325", "EXIF BrightnessValue": "-7107/116891", "EXIF ExposureBiasValue": "0", "EXIF MeteringMode": "Pattern", "EXIF Flash": "Flash did not fire, compulsory flash mode", "EXIF FocalLength": "4", "EXIF SubjectArea": "[1999, 1525, 2215, 1331]", "EXIF SubSecTimeOriginal": "336", "EXIF SubSecTimeDigitized": "336", "EXIF FlashPixVersion": "0100", "EXIF ColorSpace": "Uncalibrated", "EXIF ExifImageWidth": "2536", "EXIF ExifImageLength": "2204", "EXIF SensingMethod": "One-chip color area", "EXIF SceneType": "Directly Photographed", "EXIF ExposureMode": "Auto Exposure", "EXIF WhiteBalance": "Auto", "EXIF DigitalZoomRatio": "756/527", "EXIF FocalLengthIn35mmFilm": "40", "EXIF SceneCaptureType": "Standard", "EXIF LensSpecification": "[4, 6, 9/5, 12/5]", "EXIF LensMake": "Apple", "EXIF LensModel": "iPhone X back dual camera 4mm f/1.8"}