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a) The vacuum in the headspace of a can of food is normally formed by "hot fill" exhausting - that is, the cans are closed when the can is filled with product at a temperature of 85°C. However, a batch is inadvertently closed with the product temperature only 50°C. What will be the vacuum (negative gauge pressure) in these cans when they cool to room temperature (25°C)?
b) The gauge on a gas storage cylinder, containing 200 kg of gas, indicates a pressure of 1 MPa at 20°C. How may kilograms of gas remain if the pressure gauge shows 600 kPa when the temperature is 30°C?
A contact sulphuric acid plant burns pure sulphur with air. The products of combustion pass to a converter where some of the SO 2 is converted to SO 3 at a fast rate owing to the
leaching
Spelling resistance: The breaking or cracking or peeling off the refractory is known as spelling. A good refractory must show a good resistance to thermal spelling. Thermal spelli
Formulas for determining temporary and permanent hardness
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The most common DC applications are: Electromagnets and yokes • Relays • Magnetic shields • Electrical measuring devices • Magnetic amplifiers
Explain with sketch the process of "forging". Forging is the process by which metal is heated and is shaped by plastic deformation by suitably applying compressive force. Gener
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