Junior ScienceB.H. Sanborn, 1921 - 533 σελίδες |
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Σελίδα ix
... cool the body ? Exercises . -- PAGE 71 CHAPTER X Weather What is the weather ? Of what is the atmosphere com- posed ? What causes dew and frost ? - How are clouds formed ? Why do we have rain , snow , and hail ? - What is rainfall ...
... cool the body ? Exercises . -- PAGE 71 CHAPTER X Weather What is the weather ? Of what is the atmosphere com- posed ? What causes dew and frost ? - How are clouds formed ? Why do we have rain , snow , and hail ? - What is rainfall ...
Σελίδα 30
... cool , water rises into the bottle . What does this mean ? It means that there is less air in the jar after the candle has burned than there was before . The water rises to take the place of that part of the air which has been used up ...
... cool , water rises into the bottle . What does this mean ? It means that there is less air in the jar after the candle has burned than there was before . The water rises to take the place of that part of the air which has been used up ...
Σελίδα 34
... cool , it can no longer turn then we cannot relight the candle without heating the wick up to its kindling temperature . We can carry out the same experiment with a kerosene lamp . If we watch a burning piece of wood , es- pecially a ...
... cool , it can no longer turn then we cannot relight the candle without heating the wick up to its kindling temperature . We can carry out the same experiment with a kerosene lamp . If we watch a burning piece of wood , es- pecially a ...
Σελίδα 55
... cool air , it rises , just as a cork would , if you were to let go of it under water . Natural ventilation is , then , the method of ventilating which depends upon the entrance of cold air at the bottom of a room and the leaving of warm ...
... cool air , it rises , just as a cork would , if you were to let go of it under water . Natural ventilation is , then , the method of ventilating which depends upon the entrance of cold air at the bottom of a room and the leaving of warm ...
Σελίδα 64
... after being heated is distributed to the house . Do you think there are convection currents in a re- frigerator ? In order to cool the whole refrigerator , where should the ice be placed , near the bottom 64 JUNIOR SCIENCE.
... after being heated is distributed to the house . Do you think there are convection currents in a re- frigerator ? In order to cool the whole refrigerator , where should the ice be placed , near the bottom 64 JUNIOR SCIENCE.
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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.