Thermometer sahi tarah kaise padhein?

Thermometer ki range kya hoti hai?

Range matlab thermometer kitna kam se kam aur kitna zyada se zyada temperature naap sakta hai. Scale ke dono ends pe likhe numbers dekho. Laboratory thermometer ki range usually −10 °C se 110 °C hoti hai, lekin kuch ki range alag hoti hai, isliye jo thermometer haath mein hai use hi dekho.

Thermometer sabse chhoti kitni value padh sakta hai?

Paas-paas ke do number wale marks chuno aur unke beech ki chhoti divisions (spaces) gino. Phir divide karo:

Ek division = (do number wale marks ka fark) ÷ (unke beech ki divisions)

Number wale marks	Beech ki divisions	Ek division padhti hai
10 °C aur 20 °C	10	10 ÷ 10 = 1 °C
0 °C aur 10 °C	20	10 ÷ 20 = 0.5 °C
0 °C aur 100 °C	50	100 ÷ 50 = 2 °C

Ye value batati hai ki thermometer kitna sahi-sahi naap sakta hai. Jo thermometer ek division mein 0.5 °C padhta hai, wo 22.5 °C dikha sakta hai. Jo 2 °C padhta hai, wo nahi dikha sakta.

0 °C se neeche ka temperature kaise padhein?

Laboratory thermometer zero se neeche, lagbhag −10 °C tak, bhi dikha sakta hai. 0 °C mark ke neeche divisions neeche ki taraf gino. Agar ek division 1 °C padhti hai aur column 0 °C mark se 4 divisions neeche khatam hota hai, to reading −4 °C hai. Minus sign zaroor likho: −4 °C aur 4 °C bilkul alag temperatures hain.

Garam paani ka temperature kaise padhein?

Ye setup teacher ki madad se karo. Akele kabhi ubalta paani mat lo, sirf halka garam paani.

1. Beaker mein thoda garam paani lo.
2. Thermometer ko seedha (vertical) pakdo. Tircha mat karo.
3. Use aise dubao ki bulb poora paani mein ho, lekin beaker ki tali ya deewar ko na chhue.
4. Liquid column ko upar jaate dekho. Jab wo ruk jaaye tab tak intezaar karo, lekin zyada der mat karo, warna paani khud thanda hone lagega.
5. Reading tab lo jab bulb abhi bhi paani mein ho, aur aankh liquid column ke top ki seedh mein ho.
6. Reading unit ke saath likho, jaise 41 °C.

Thermometer paani se bahar nikaalte hi column girne lagta hai. Uske baad li gayi reading galat hogi.

Ek hi paani ki reading classmates ki alag kyun aati hai?

Agar paanch students ek hi beaker ka paani padhein, to unke jawab thode alag ho sakte hain. Usually wajah inme se koi hoti hai:

• Aankh column ke top se upar ya neeche thi.
• Thermometer tircha tha.
• Bulb beaker ki tali ya deewar ko chhoo raha tha.
• Reading thermometer bahar nikaalne ke baad li gayi.
• Reading bahut der se li gayi, jab paani thanda ho chuka tha.

Thermometer sahi tareeke se padhoge to sabke jawab ek-doosre ke kareeb aayenge.

Digital thermometer ka kya?

Digital clinical thermometer aasaan hai: reset dabao, beep ya light ka intezaar karo, aur display pe number padho. Divisions ginne ki zaroorat nahi. Use karne se pehle aur baad mein tip ko sabun aur paani se dho, display ko paani se bachate hue.