page_title: Water rocket
section_title: Bottle
hierarchical_section_title: Water rocket / Elements / Bottle
context_page_description: A water rocket is a type of model rocket using water as its reaction mass. The water is forced out by a pressurized gas, typically compressed air. Like all rocket engines, it operates on the principle of Newton's third law of motion. Water rocket hobbyists typically use one or more plastic soft drink bottle as the rocket's pressure vessel. A variety of designs are possible including multi-stage rockets. Water rockets are also custom-built from composite materials to achieve world record altitudes.
context_section_description: Typically a single polyethylene terephthalate (PET) carbonated soft drink bottle serves as the pressure vessel. Multi-bottle rockets are created by joining two or more bottles in any of several different ways; bottles can be connected via their nozzles, by cutting them apart and sliding the sections over each other, or by connecting them opening to bottom, making a chain to increase volume. This adds complexity and the increased volume leads to increased weight - but this should be offset by an increase in the duration of the thrust of the rocket.
  Multi-stage rockets are much more complicated. They involve two or more rockets stacked on top of each other, designed to launch while in the air, much like the multi-stage rockets that are used to send payloads into space.
caption: A larger multi bottle rocket with cylindrical fins.
exif: {"Image ImageDescription": "", "Image Make": "SONY", "Image Model": "DSC-T1", "Image XResolution": "72", "Image YResolution": "72", "Image ResolutionUnit": "Pixels/Inch", "Image DateTime": "2005:12:03 20:13:32", "Image YCbCrPositioning": "Co-sited", "Image ExifOffset": "328", "Image CustomRendered": "Normal", "Image ExposureMode": "Auto Exposure", "Image WhiteBalance": "Auto", "Image SceneCaptureType": "Standard", "Image Contrast": "Normal", "Image Saturation": "Normal", "Image Sharpness": "Normal", "Image PrintIM": "[80, 114, 105, 110, 116, 73, 77, 0, 48, 50, 53, 48, 0, 0, 2, 0, 2, 0, 1, 0, 0, 0, 1, 1, 0, 0, 0, 0]", "Thumbnail Compression": "JPEG (old-style)", "Thumbnail Make": "SONY", "Thumbnail Model": "DSC-T1", "Thumbnail Orientation": "Horizontal (normal)", "Thumbnail XResolution": "72", "Thumbnail YResolution": "72", "Thumbnail ResolutionUnit": "Pixels/Inch", "Thumbnail DateTime": "2005:12:03 20:13:32", "Thumbnail JPEGInterchangeFormat": "2370", "Thumbnail JPEGInterchangeFormatLength": "12071", "EXIF ExposureTime": "1/40", "EXIF FNumber": "7/2", "EXIF ExposureProgram": "Program Normal", "EXIF ISOSpeedRatings": "160", "EXIF ExifVersion": "0220", "EXIF DateTimeOriginal": "2005:12:03 20:13:32", "EXIF DateTimeDigitized": "2005:12:03 20:13:32", "EXIF ComponentsConfiguration": "YCbCr", "EXIF CompressedBitsPerPixel": "8", "EXIF ExposureBiasValue": "0", "EXIF MaxApertureValue": "29/8", "EXIF MeteringMode": "Pattern", "EXIF LightSource": "Unknown", "EXIF Flash": "Flash fired, compulsory flash mode, red-eye reduction mode, return light not detected", "EXIF FocalLength": "67/10", "EXIF FlashPixVersion": "0100", "EXIF ColorSpace": "sRGB", "EXIF ExifImageWidth": "1536", "EXIF ExifImageLength": "2048", "EXIF FileSource": "Digital Camera", "EXIF SceneType": "Directly Photographed"}