23. 〃 Equal Volumes of Different Things under the same circumstances, have Different Weights: the Density of Different Bodies is Different 32 24. 〃 The Meaning of Heavy and Light—Specific Gravity 33 25. 〃 Things of greater Specific Gravity than Water sink in Water; Things of less Specific Gravity float 34 26. 〃 A Body which Floats in Water always occupies as much Space beneath the level of the Surface of the Water as is equal to the Volume of Water which weighs as much as that Body; in other words, it displaces its own Weight of Water 36 27. 〃 Water Presses in all Directions 37 28. 〃 The Transference of Motion by Moving Water: the Momentum of Moving Water 40 29. 〃 The Energy of Moving Water 43 30. 〃 The Properties of Water are Constant 47 31. 〃 Increase of Heat at first causes Water to Increase in Volume 48 32. 〃 Increase of Heat at length causes Water to become Steam 50 33. 〃 The taking away of Heat from Steam causes the Steam to change into Hot Water 51 34. 〃 When Water is changed into Steam, its Volume becomes about 1,700 times greater than it was at first 51 35. 〃 Gases or Elastic Fluids. Air 52 36. 〃 Steam is an Elastic Fluid or Gas 54 37. 〃 Gases and Vapours 55 38. 〃 The Evaporation of Water at ordinary Temperatures 56 39. 〃 When Hot Water is cooled, it Contracts to begin with, but after a time Expands 57 40. 〃 Water cooled still further becomes the transparent brittle solid Ice 58 41. 〃 Ice has less Specific Gravity than the Water from which it was formed 59 42. 〃 Hoar Frost is the Gaseous Water which exists in the Atmosphere, condensed and converted into Ice Crystals 60 43. 〃 When Ice is warmed it begins to change back into Water as soon as the Temperature reaches 32° 61 44. 〃 Ice the solid, Water the liquid, and Steam the gas, are three states of one natural object; the Condition of each State being a certain Amount of Heat 62