Junior ScienceB.H. Sanborn, 1921 - 533 σελίδες |
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Σελίδα xiv
... color of sunlight ? rainbow ? Why does an object have color ? How can we trap sunlight ? How does the eye see ? - Exercises and sum- mary . ―― CHAPTER XXVII Light in the House - How do we get sunlight into the house ? How have men ...
... color of sunlight ? rainbow ? Why does an object have color ? How can we trap sunlight ? How does the eye see ? - Exercises and sum- mary . ―― CHAPTER XXVII Light in the House - How do we get sunlight into the house ? How have men ...
Σελίδα 38
... color than air has . Perfectly pure oxygen has neither odor nor taste . If we light a pine splinter , and put it for an instant into a jar of oxygen , the wood burns much more vigor- w . b . FIG . 23. -a . When burning sulphur is put ...
... color than air has . Perfectly pure oxygen has neither odor nor taste . If we light a pine splinter , and put it for an instant into a jar of oxygen , the wood burns much more vigor- w . b . FIG . 23. -a . When burning sulphur is put ...
Σελίδα 41
... color of zinc rust ? Why is zinc used for washboards instead of iron or copper ? 7. Covering wood with an oxide protects it against fire . Why ? 8. Let an empty " tin " can rust without losing any material . Does the rusted can weigh ...
... color of zinc rust ? Why is zinc used for washboards instead of iron or copper ? 7. Covering wood with an oxide protects it against fire . Why ? 8. Let an empty " tin " can rust without losing any material . Does the rusted can weigh ...
Σελίδα 127
... color ; some dis- solve , others do not ; some are light and some are heavy ; some we can see through ( they are transparent ) and others we cannot see through ( they are opaque ) ; some we can set on fire and others refuse to burn ...
... color ; some dis- solve , others do not ; some are light and some are heavy ; some we can see through ( they are transparent ) and others we cannot see through ( they are opaque ) ; some we can set on fire and others refuse to burn ...
Σελίδα 132
... color- less as air and oxygen . As we make it , it has an odor , but the pure gas is odorless . It is the lightest gas known : air is 14.4 times as heavy as hy- drogen ; oxygen is 16 times as heavy ; carbon dioxide is 22 times as heavy ...
... color- less as air and oxygen . As we make it , it has an odor , but the pure gas is odorless . It is the lightest gas known : air is 14.4 times as heavy as hy- drogen ; oxygen is 16 times as heavy ; carbon dioxide is 22 times as heavy ...
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Άλλες εκδόσεις - Προβολή όλων
Συχνά εμφανιζόμενοι όροι και φράσεις
acid ammonia animals bacteria becomes blood body boiling bones bottle breathing bulb burning called candle carbon dioxide carry cause cells cerebrum changed cloth coal cold color cool copper covered digestive dish dry cell earth electric current epidermis evaporate feet fire flame force give glass grow heat hydrochloric acid hydrogen inside iron kerosene kerosene lamp lamp layers learned light rays limewater liquid lungs machine magnet manganese dioxide material melted metal milk moon mouth move muscles needle nerve nitrogen nonconductor object oxide oxygen pass phosphorus piece pipes plants pole potassium chlorate pounds pressure produce pull pump push rock rubbed sal ammoniac salt seeds skin soil solution starch steam stomata stove substances sugar sulphur sunlight surface temperature tissue trees tube vibrations warm weather weight wind wire wood yeast zinc
Δημοφιλή αποσπάσματα
Σελίδα 509 - Measures of Weight 10 milligrams (mg) =1 centigram eg 10 centigrams =1 decigram dg 10 decigrams =1 gram g 10 grams =1 dekagram Dg 10 dekagrams =1 hektogram Hg 10 hektograms =1 kilogram Kg...
Σελίδα 402 - THIS is the forest primeval. The murmuring pines and the hemlocks, Bearded with moss, and in garments green, indistinct in the twilight, Stand like Druids of old, with voices sad and prophetic, Stand like harpers hoar, with beards that rest on their bosoms...
Σελίδα 509 - Measures of Length 10 millimeters (mm.) . . . . =1 centimeter cm. 10 centimeters =1 decimeter dm: 10 decimeters =1 meter m. 10 meters =1 dekameter Dm. 10 dekameters =1 hektometer Hm. 10 hektometers =1 kilometer Km.
Σελίδα 509 - Area. 100 square millimeters (sq. mm.) =1 sq. centimeter (sq. cm.). 100 square centimeters = 1 sq. decimeter (sq. dm.). 100 square decimeters =1 sq. meter (sq. m.). 3. Cubic Measure, or Volume. The unit of volume is the liter, which is 1 cu. dm., or 1,000 cc 1,000 cubic millimeters (cu. mm.) = 1 cubic centimeter (cc). 1,000 cubic centimeters =1 cubic decimeter (cu. dm.). 1 cubic decimeter = 1 liter (1.). 10 liters =1 dekaliter (dl.). 10 dekaliters =1 hectoliter (hl.). 10 hectoliters = 1 kiloliter...
Σελίδα 105 - The known principal planets, in order of their distance from the Sun are: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, and Pluto.
Σελίδα 339 - Levers are divided into three classes: in the first class, the fulcrum ' is between the power and the weight ; in the second class, the fulcrum is...
Σελίδα 86 - The wind arrows show the wind to be moving in a direction opposite to the movement of the hands of a watch (counterclockwise) when it is laid, face up, on the map.
Σελίδα 243 - ... north pole of one magnet will attract the south pole of another, and the south pole of one will attract the north of another ; but the north...
Σελίδα 53 - The oxygen is carried by the blood to all parts of the body...
Σελίδα 331 - In the second class of levers th'e fulcrum is at one end and the power at the other, with the weight between them.