Digital sand timer with artistic design. Time flows and does it stylishly. This digitized hourglass can be used to time anything for up to 60 minutes. It's like having a nice looking visual indicator of how much time is left on your task.* KIDS FRIENDLYTimer visualizes time to kids and lets them feel the time. Without reading or even knowing the numbers one can look at the visualized time flow, feel it and understand how long to wait or whether to hurry up.* STAY NOTIFIEDIt lets you set the alarm sound that will play when the timer is finished. You can choose from 16 unique alarm sounds, melodies and loops. You’ll be notified when your time is up even if you’re using another app or your device is locked. It can also repeat the sound alarm (up to 3 times) at the given interval if it was missed/snoozed.* COLOR YOUR TIMEYou can easily change the timer color to fit your personal lifestyle. There are 5 color themes: turquoise, red, green, amber and pink. Just pick the one you like in the application settings.* UNIVERSAL APPTimer works both on your iPhone/iPod and iPad, contains HD graphics for retina and iPad displays and supports all screen orientations for all devices. [+Retina graphics for iPad 3rd generation]* SEE ALSO: Best TimerBeautifully designed sand timer, stylish kitchen timer, countdown/up and powerful stopwatch All in one creatively combined Best Timer application to suit all your timing needs. Search "Best Timer" on iTunes (http://itunes.apple.com/app/best-timer/id415656570) 洪琮欽 時間倒數 Digital sand timer with artistic design. Time flows and does it stylishly. This digitized hourglass can be used to time anything for up to 60 minutes. It's like having a nice looking visual indicator of how much time is left on your task.* KIDS FRIENDLYTimer visualizes time to kids and lets them feel the time. Without reading or even knowing the numbers one can look at the visualized time flow, feel it and understand how long to wait or whether to hurry up.* STAY NOTIFIEDIt lets you set the alarm sound that will play when the timer is finished. You can choose from 16 unique alarm sounds, melodies and loops. You’ll be notified when your time is up even if you’re using another app or your device is locked. It can also repeat the sound alarm (up to 3 times) at the given interval if it was missed/snoozed.* COLOR YOUR TIMEYou can easily change the timer color to fit your personal lifestyle. There are 5 color themes: turquoise, red, green, amber and pink. Just pick the one you like in the application settings.* UNIVERSAL APPTimer works both on your iPhone/iPod and iPad, contains HD graphics for retina and iPad displays and supports all screen orientations for all devices. [+Retina graphics for iPad 3rd generation]* SEE ALSO: Best TimerBeautifully designed sand timer, stylish kitchen timer, countdown/up and powerful stopwatch All in one creatively combined Best Timer application to suit all your timing needs. Search "Best Timer" on iTunes (http://itunes.apple.com/app/best-timer/id415656570)

吉他及烏克麗麗的調音器,數位型的指針方式,安裝於手機可作為隨身的調音器,只要先選擇弦樂器的種類,然後分別按照一二三四弦的音撥動琴弦,指針會自動指向,只要一邊調整弦的鬆緊,一邊將撥出的音調整到畫面的中間即可,簡單明瞭 陳怡光 Tuner - gStrings Free 從國小以上到國中各年級都適用,大人也合用,尤其是現在非常流行的樂器--烏克麗麗,常常需要調音,傳統的調音機對於絕對音感不好的多數學生而言,調到正確的音較為吃力,花了很多的時間調音,常常調出來的音卻不是正確的標準音高,而買數位科技的調音機雖然方便,但畢竟是要多花一筆錢,對學生又是另一個支出,有這個小小不佔空間的軟體就可以調出許多弦樂器的標準音,更重要的是免費,可以作為老師或學生方便又實用的工具,出外演出的好幫手.

香港, 中國, 台灣常用的度量衡單位轉換程式, 備有實時換算, 可輸入負數, 暫時提供以下幾類單位換算: 1. 重量 2. 長度 3. 面積 4. 體積/容量 5. 溫度 6. 功率 7. 速度 8. 壓力 9. 電腦記憶體單位其他功能:* 支援 APP2SD* 支援 簡體中文, 繁體中文 黃秉勝 單位換算 (免費版) 單位換算是很多學生常搞不清楚的部分，此app包括了常用的重量、長度、面積、體積/容積、溫度等的單位換算，對於學生與老師都是學習與教學上的重要利器。

熱對流是什麼？熱對流是指透過氣體或液體等流體的「流動」，將熱量帶到其他地方的傳遞方式。當流體的一部分受熱時，其體積會膨脹、密度變小而上升；與此同時，周圍較冷、密度較大的流體會流過來填補空隙。這種「上升」與「填補」的持續過程，帶動了整體的物質循環，進而達成熱量的傳播。在日常生活中，電暖器裝在室內下方、冷氣機裝在上方，或是燒開水時水壺底部的熱水往上跑，都是熱對流的典型應用。

熱對流是什麼？熱對流是指透過氣體或液體等流體的「流動」，將熱量帶到其他地方的傳遞方式。當流體的一部分受熱時，其體積會膨脹、密度變小而上升；與此同時，周圍較冷、密度較大的流體會流過來填補空隙。這種「上升」與「填補」的持續過程，帶動了整體的物質循環，進而達成熱量的傳播。在日常生活中，電暖器裝在室內下方、冷氣機裝在上方，或是燒開水時水壺底部的熱水往上跑，都是熱對流的典型應用。

二次電池（Secondary Battery）又稱可充電電池或蓄電池，是指電量耗盡後可透過外部接電、進行化學能反向轉換以「重複充電使用」的電池。常見類型包括鋰離子電池、鉛酸電池、鎳氫電池等，具備高循環壽命，廣泛應用於電動車、手機、筆記型電腦及儲能系統。 鋅銅電池（Danielle cell）是一種將化學能轉化為電能的電化電池（一次電池）。它以鋅片為負極（氧化反應）、銅片為正極（還原反應），硫酸鋅與硫酸銅為電解液。電子由鋅片流向銅片，鹽橋負責平衡離子電荷，具有原理清晰的特性。

綠色化學是指在進行商品製造時，需要設計出友善環境、注重人體安全時，也能兼顧生產的效益。綠色化學之父 John C. Warner 在他出版的綠色化學書——《綠色化學：理論與實踐》歸納出綠色化學十二項原則，讓生產者能在製造商品時借著這些原則來製造出安全及環保的產品。

界面活性劑具有讓油和水相溶的特性；小蘇打則是利用鹼可與油反應的特性，進而使污垢易被水帶走，皂化反應用鹼分解油脂，讓肥皂分子變成具親油性和親水性的兩端，達到包覆油污、用水帶走的效果，界面活性劑具有破壞水的表面張力、讓油水互溶、起泡等特性。

二氧化碳濃度越高，照射白熾燈泡後升溫越多。LED照明燈是低用電、低耗能之節能應用，認識碳足跡，從知道個人碳足跡，知道節能減碳就從你我開始。

認識體積和容積的差異。物體所佔的空間大小是「體積」，容器內部的空間體積稱為「容積」，學習用排水法測量不規則物體體積，亦可使用壓沉法，將物體完全壓沒水中，就可用排水法量測物體體積。