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EDEXCEL IGCSE PHYSICS 5-1 Density and Pressure. THIS POWERPOINT IS NOT DUE FOR COMPLETION UNTIL JULY 2012. December 4 th 2010. All content applies for Triple & Double Science. Edexcel IGCSE Physics pages 162 to 168. Section 5: Solids, liquids and gases b) Density and pressure

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## EDEXCEL IGCSE PHYSICS 5-1 Density and Pressure

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**EDEXCEL IGCSE PHYSICS 5-1Density and Pressure**THIS POWERPOINT IS NOT DUE FOR COMPLETION UNTIL JULY 2012 December 4th 2010 All content applies for Triple & Double Science Edexcel IGCSE Physics pages 162 to 168**Section 5: Solids, liquids and gases**b) Density and pressure recall and use the relationship: density = mass / volume ρ = m / V describe how to determine density using direct measurements of mass and volume recall and use the relationship: pressure = force / area p = F / A understand that the pressure at a point in a gas or liquid which is at rest acts equally in all directions recall and use the relationship: pressure difference = height × density × g p = h × ρ × g Edexcel IGCSE Specification**Density (ρ)**density = mass volume ρ = m / V unit = kg m-3 Note: 1 g cm-3 is the same as 1000 kg m-3**Density examples**7 900 10-25 to 10-15 0.0989 11 300 13 500 0.179 19 100 1.29 19 300 700 osmium 22 610 0.534 150 000 1000 1017 850to1400 2 700 > 4 x 1017**Question**Calculate the weight of a gold ingot of dimensions (20 x 10 x 4) cm volume of gold = 800 cm3 = 0.0008 m3 mass = volume x density = 0.0008 x 19 300 = 15.4 kg weight = 15.4 x 9.81 weight of gold ingot = 152 N**Answers**Complete: 6 g cm-3 1.5 m3 64 g 3 g cm-3**Density and Pressure Notes questions from pages 162 to 168**• Answer the questions on page 168. • Verify that you can do all of the items listed in the end of chapter checklist on page 168.

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